Error code 80090016 Trusted Platform Module has malfunctioned.

Open Regedit.MSC with administrator account and navigate to :

HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb

Afterwards create DWORD (32-bit) Value Key

Rename it with : ProtectionPolicy  and set value to 1

Afterwards try to open affected 365 App it should force it log in page and enroll again. 

At this stage Outlook,OneDriveshould work as expected.

After researching this for a while - and finally trying out this solution... it was... actually a solution! Thumbs up! Thanks! 

The images you posted did not come through.  Please try to repost as my previous posted solution did not "stick" and I'm back to logging in to my MS Windows and related apps each and every time I reboot.

Open Regedit.MSC with administrator account and navigate to :

HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb

Afterwards create DWORD (32-bit) Value Key

Rename it with : ProtectionPolicy  and set value to 1

Afterwards try to open affected 365 App it should force it log in page and enroll again. 

At this stage Outlook,OneDriveshould work as expected.

After researching this for a while - and finally trying out this solution... it was... actually a solution! Thumbs up! Thanks!

OK, I devoted some more time to this issue this morning.  And, viola I was able to correct the issue.  Here were my steps:

1. I deleted all my work / school MS accounts;
2. I cleared the TPM using the instructions here;

 https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-vista/cc749022(v=ws.10)?redirectedfrom=MSDN

3. I added my work / school MS accounts at Settings/Accounts/Access Work or School; and,
4. Set up PIN at Settings / Accounts / Sign-in Options

To confirm correction I rebooted twice needing only my PIN to log in and confirmed both my personal and work/school accounts were logged on.  Then I shut down, waited ~20 minutes and turned the computer back on.  I was able to log in with only my PIN and all accounts were available without further login trauma!

Hope this works for others.  Fingers crossed.

Well I first tried clearing the TPM cache using the below:

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-vista/cc749022(v=ws.10)?redirectedfrom=MSDN

It did not fix this issue

Then along came the Win10 v20H2 upgrade.  With hope and anticipation I installed the upgrade.

Alas, it too did not fix this issue.

Due to the pandemic all the MS stores are closed and telephone support is not responsive.

In the meantime, I continue repeat my login ritual almost daily and hope that someday soon MS will effectively address this issue with a patch release.

I have this exact same issue. 

I have been on the phone lines with Microsoft for weeks now. They have no clue what they are doing. I've discussed this with a few representatives and they are clueless. 

I'm a small business and of all the service providers I work with Microsoft has by far been the worst experience. I would have never guessed that.  This has taken days of my life troubleshooting with little help from Microsoft.   As a small business owner, I'll carry experiences like this with me as I move along. 

Working with the employees I dont get the sense they care much. It feels like they are just trying to run out the shot clock to where someone needs to scrap their computer and move on.  

As of today, I've never been more disgusted by a company that I am with Microsoft. Truly as shame this exists and they have no solutions. Literally leaving people and businesses to drown.