Dear Daniel Arechiga Bernal,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are having issue sign Microsoft Access with the account that are used in Microsoft Word, Power point, Exce and etc..
To help you better, we would like to collect more detailed information you're experiencing to us so that we can have a further investigation:
- If you are having issue with personal account like Gmail.com, Outlook.com, Hotmail.com etc. or a work/school account organized by your organization?
- Would you please share your Office version by navigating to Word>File>Account and take a full screenshot?
- Is Microsoft Access installed with Office pack with Microsoft Word, Power point, Excel or installed by other ways?
- Where there be any error prompt if you sign the account in M365 portal?
Meanwhile, please check if SaRA tool can help.
For your reference: About the Microsoft Support and Recovery Assistant - Microsoft Support
We'd also recommend you Reset activation state for Microsoft 365 Apps for enterprise - Microsoft 365 Apps | Microsoft Learn to check the outcome.
Welcome to post back when you have any update, we will continue doing best to assist you.
If the understanding above is not consistent with yours, please feel free to post back and point that.
Your understanding and patience will be highly appreciated. We hope that you are keeping safe and well!
Thanks for your cooperation.
Sincerely,
Rhoda | Microsoft Moderator