Outlook Mobile cannot send meeting‑related email. Normal email sends fine. RSVP acceptance does nothing.

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Outlook Mobile cannot send meeting‑related email. Normal email sends fine. RSVP acceptance does nothing.

Richard Walker 0

Outlook Mobile cannot send meeting‑related email. Normal email sends fine. RSVP acceptance does nothing. I’ve already removed ActiveSync, reset Outlook Mobile, cleared calendar storage, and tested with a new calendar. I need a mailbox‑level calendar permissions reset.”

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Answer 1

BabybooHN 2,955 Independent Advisor

Dear @Richard Walker,

I understand that normal email works fine in Outlook Mobile, but meeting‑related emails (RSVPs, acceptance, etc.) are not sending. Since you’ve already tried removing ActiveSync, resetting Outlook Mobile, clearing calendar storage, and testing with a new calendar, the next step is to check mailbox‑level calendar permissions.

In Microsoft 365, calendar permissions are managed at the mailbox level. I recommend resetting them using Outlook on the web or PowerShell:

In Outlook on the web, right‑click your calendar > Sharing and permissions > remove existing permissions and re‑add them. Please refer to this document: Share and access a calendar with edit or delegate permissions in Outlook
If you have admin rights, you can use PowerShell with the Remove-MailboxFolderPermission and Add-MailboxFolderPermission cmdlets to reset permissions. Official documentation: Manage permissions for recipients. Please refer to this document: Set-MailboxFolderPermission

If the issue persists after resetting permissions, please confirm whether the problem occurs only on Outlook Mobile or also on Outlook desktop/web. This helps determine if it’s a client‑specific issue or a mailbox configuration issue.

I’ll continue to support you until this is resolved.

If the answer is helpful, please click "Yes" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Richard Walker 0 Reputation points

2026-08-06T00:32:14.38+00:00

Thank so much for responding. This is my personal email and personal Office 365 account and my personal Outlook account. This is not a business account. First let me say my desktop is working fine. No issues with the desktop. I'm not trying to share my calendar. This is my personal calendar. I have uploaded some screen shots of my chats with Copilot that was trying to help me troubleshoot this issue through the "Contact Outlook Mobile Support" chat. Shouldn't I have access to me own calendar be default and not need to set any permissions? Again my desktop works fine. Both the desktop Outlook calendar and my Outlook mobile were both working until Saturday Aug 2.
BabybooHN 2,955 Reputation points Independent Advisor

2026-08-06T03:42:47.4133333+00:00
Dear @Richard Walker,

Because personal accounts do not use Exchange admin tools (like PowerShell or MFCMAPI), and since Outlook Desktop works properly, the issue is isolated to the cloud sync partnership between Outlook.com and your Outlook Mobile app.
Remove and Re-add the Account in Outlook Mobile

Ensure Outlook Mobile connects using the primary Microsoft Account protocol rather than a standard IMAP/POP connection (which cannot process RSVPs):

Open the Outlook app on your phone.

Tap your profile icon (top left) and tap the Settings (Gear) icon.

Tap your personal email account, scroll down, and tap Delete Account > Delete from This Device.

Force close the Outlook app and restart your phone.

Open the Outlook app, tap Add Account, and select Outlook.com (sign in directly with your Microsoft Account credentials).

If your personal Microsoft account uses a third-party email address (such as @gmail.com or @yahoo.com) as its primary login alias, Outlook Mobile may fail to send calendar RSVPs:

Go to Microsoft Account Manage Aliases.

Ensure an official @outlook.com or @hotmail.com address is set as your Primary Alias.

If necessary, sign into Outlook Mobile using that @outlook.com primary alias.

Once you re-add the account via the Outlook.com option, send a test meeting RSVP from your mobile app.

Please let me know if the RSVPs start sending properly after resetting the mobile device partnership.
Richard Walker 0 Reputation points

2026-08-06T18:49:00.3833333+00:00

Thanks so much for providing these instructions. I opened Outlook.com and I cannot find a mobile device option under the General Tab, nor can I find that option in the browser version of Outlook.com based upon the instructions you explained in step 1.
BabybooHN 2,955 Reputation points Independent Advisor

2026-08-07T01:41:35.8566667+00:00
Dear @Richard Walker,

Since this issue persists even after re-adding your account, and because this appears to be isolated to how your specific account interacts with the mobile server, the best way to get this resolved is to contact the dedicated in-app support team. They have the tools to check your account’s synchronization status directly.

Here are the step-by-step instructions to connect with a personal support agent:

Go to the Microsoft Contact Us Support Page.

In the search bar, type "Outlook Mobile RSVP issue" and click Get Help.

Scroll down to the bottom of the page and click the Sign in to Contact Support button (or Contact Support).

Sign in with your personal Microsoft account (⁠@outlook.com⁠, ⁠@hotmail.com⁠, etc.).

Under Products and Services, select Microsoft 365 and Office.

Under Category, select Outlook (or Technical Support).

Click Confirm, then select Chat with a support agent in your web browser.

An agent will be able to review your account's cloud synchronization status directly in real-time.

Answer 2

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Answer 3

Richard Walker 0

This problem started occurring after I power outage at my home. I was on my desktop working with my desktop Outlook calendar open. The power when out and them my mobile stopped responding to RSVPs. The desktop rebooted after the power outage and continued to work normally. However, the mobile version of Outlook would work fine except for RSVPs. After about a week and a half another power outage happened, and the mobile version began to work correctly and accept RSVPs. The home network router was rebooted during both outages. Also, during that time, a new version of Outlook mobile was uploaded to my phone. After speaking with Microsoft Support team, they seemed to believe that the newly deployed version was responsible for correcting the problem.

BabybooHN 2,955 Reputation points Independent Advisor

2026-08-18T02:19:21+00:00

Dear @Richard Walker,

Thank you for following up and sharing those details about how the issue was resolved!

It is very helpful to know that the issue self-corrected following the recent Outlook Mobile app update and network restart. Based on the sequence of events, Microsoft Support's assessment is very plausible app updates often include subtle bug fixes and sync engine patches that address localized active session hangs or token corruption (which can occasionally occur if a desktop client abruptly disconnects during a sync cycle like a power outage).

I appreciate you taking the time to share your resolution steps with the community. If you run into any other issues in the future, please don't hesitate to reach back out!