Windows activation after bios update

yes, the key format is what you wrote but it is the one obtained by buying Win10/11 pro over MS Store and read by AIDA64.
There is a silent change by MS about how licenses are handled at least what I can figure out after my new bios update on msi meg Z790 ACE.

The new bios brings some OC Memory optimizations and new microcode's and support for 14th Gen Intel CPU

To be sure before flashing I disabled TPM from bios and here comes the difference, I was able to login directly to Win11 without the idiotic "CHANGE PIN" procedure, no questions asked.
Checked Win status it stated Activated.
Did the flash, set the bios as per my liking but kept TPM Disabled, logged in Win 11 with new bios no question asked and no "CHANGE PIN" BS .

Checked thew activation status and everything is OK.

Don't know for sure but looks like MS did something about the licensing problem or my conversation with MS support and mailing back and forth did something with my account and how it handles the licenses.
I just hope it stays this way and good luck to you people!

I have the exact same motherboard and did the recent bios update and bam here I am trying to figure out this issue, had no idea the bios update would mess up windows 11 pro activation. Was told to run repair media by MS support to solve issue. I did get the change pin issue when first starting it up, just signed in with password, removed pin and set it again that solved it and thought all was good. UNTIL yesturday a windows update and then today a watermark on the desktop to activate, almost seems like the windows update caused it but could have been not activated for the last week since doing bios update and had no idea.

It is garbage that is issue has not been completely addressed. Apparently you have to ask Microsoft for permission to update your hardware now or you lose your license. Next time I do any changes as such, I'm going to contact Microsoft FIRST and make them stay on the phone while I make the changes. Make them confirm that I do have a license that is valid BEFORE making the changes, and then keep them on the phone for the reboot to see if Windows deactivates. I'll even share my screen with them so they know I'm using the same machine and not trying to activate on another. If that doesn't get them to make changes, I'm not sure what would.

Yup, this **** is STILL going on. Perfect example of "don't update your BIOS unless you HAVE to." Hadn't checked for BIOS in quite a while on my z690 Tomahawk and realized there was a ton of drivers and several BIOS updates since my last update cycle so I went ahead and shot myself in the foot like everyone else here just to see if I could get my ram stable at the XMP speeds it was advertised at since I'd had problems in the past.

I've spent hours now attempting pretty much everything everyone here has suggested to no help whatsoever. To put it lightly this is freaking ridiculous that it still hasn't been addressed in over a year.