Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This is a known headache with pre-installed OEM Office licenses, and it usually comes down to how those licenses get activated in the background. A few things worth digging into:
Check the activation type: Run cscript ospp.vbs /dstatus from the Office install folder (usually C:\Program Files\Microsoft Office\Office16) instead of just /dstatusall — it'll tell you whether the license was a Retail, OEM:NONSLP, or OEM:PERPETUAL channel. OEM pre-installs are often tied to the device's motherboard/firmware license (via an embedded product key in the BIOS/UEFI, similar to how Windows OEM licenses work), not to your Microsoft account directly — so "grace period" suggests it's lost contact with whatever was validating it, which could genuinely be account-related, or could be a separate activation service issue unrelated to your account at all.
The "Welcome to Windows 11" email is a red flag worth pursuing separately: if you upgraded in 2021, Microsoft sending that now suggests something odd happened on their end with your account or device record recently — possibly your device got re-registered, deduplicated, or merged with another record during a backend migration, and Office licensing tied to that device entitlement could have been dropped as a side effect. I'd mention this email specifically to Microsoft support as a timeline anchor — it's a concrete, dated event that lines up suspiciously with your Office disappearing.
For "proof of purchase": Since it was pre-installed rather than purchased separately, look for the original order confirmation/invoice from HP (or wherever you bought the laptop) — some retailers list "Microsoft Office Home & Student 2019" as a line item or bundled SKU even when it's not on the general spec sheet. Check your email from the purchase date, not HP's current spec page (spec pages get updated/changed after the fact and aren't reliable evidence). Also check if the laptop's original packaging or a Certificate of Authenticity sticker (separate from a basic "Office" logo sticker) exists — that's often what activation support actually wants.
Escalate past first-line support: General Microsoft support often can't resolve OEM entitlement issues. Ask specifically to be escalated to the Microsoft 365 activation/licensing team, and reference your ospp.vbs /dstatus output and the Windows 11 email timing — that combination of technical detail plus a dated anomaly tends to get taken more seriously than a general "it disappeared" ticket.