I helped my sister deal with this. Bitlocker activated itself, the keys were in her account which she had access to. She had done everything properly but nothing worked to resolve it.

There’s countless forum posts on it since about 2021 if you go looking for it. None of the recovery processes worked so I reformatted and enabled bitlocker at the start. Next time I visit, she’s getting Linux Mint.

Fuck Microsoft. End users shouldn’t be expected to troubleshoot like that.