TPM backed encryption on Dell Precision 5490 results in asking for Recovery Key endlessly.

[Alslinet]

There are a number of issues here. The primary one being that im asked for the recovery key after installing ubuntu 26.04 LTS.
The other issue is it seems to initiatite a reboot after some time on the recovery key screen. This would be impossible for a person with a disability to enter before the boot happens. My suggestion is drop the restarte on this screen completely and figure out whats wrong with the PCRs. I havent been able to find the specific details.

This happens consistently after numerous rounds of:

• Verifying secure boot is enabled
• Clearing the TPM
• Installing Ubuntut 26.04 LTS and enabling hardware backed (TPM) encryption.

[Alslinet]

Same issue occurs on Dell Latitude 5450.

[Alslinet]

Looking into it furthere these seem to be relevant events:
snap-bootstrapError with keyslot "default":
cannot recover keys from keyslot:
incompatible key data role params:
invalid PCR policy data:
cannot complete authorization policy assertions:
the PCR policy is not authorized for the current configuration

Fallback also fails:
snap-bootstrapError with keyslot "default-fallback":
cannot recover keys from keyslot:
incompatible key data role params:
invalid PCR policy data:
cannot complete authorization policy assertions:
the PCR policy is not authorized for the current configuration

[Alslinet]

Let me know if you need any additional logs.

[Alslinet]

The problem also appears on the Dell Pro Max.