[uolmir]

I don't know your circumstances but often you retain the right to distribute a "post print", ie the final text as published but absent journal formatting. A dissertation should fit that definition.

[gillesjacobs]

This is indeed often the case, however, my university reviews each thesis, and deemed it can only change to open access in 2026 (+5 years from defense).

I think this is default policy for thesis based on publication agreements here.

In any case, I am not too worried.