No update possible for plugins, themes and wordpress (6.8.3)

[wpo-HR]

wordpress 6.8.3. was installed automatically on my wordpress website gfcev.de.

I now have a problem on my backend.
When I try to update plugins or when I try to reinstall wordpress I get the message
"Aktualisierung fehlgeschlagen: Der Link, dem du gefolgt bist, ist abgelaufen.Bitte versuche es nochmal." / "Update not successful. The link you are using is no longer active. Please try again."
An update of a normal page ist still working.
When I try to update a special page (calendar entry of all-in-one event calendar of timely) I get the same error message as above.

Strangly my staging website with same plugin settings is still correctly working and updating.

Any idea what causes this error message?

(I selected V 6.8.2 in the dropdown field because V 6.8.3 is not yet available)

[wpo-HR]

In the meantime I could solve my problems. It appears that after the recent wordpress update last tuesday there was a conflict between the plugin 'Theme My Login' and probably the wordpress core. User authorisations were no longer correctly handled which resulted in the error message "Update not successful. The link you are using is no longer active. Please try again.".

With the plugin 'Query Monitor' I could see that the error message was initiated by the mentioned plugin above. Fortunatelly I could still activate and deactivate plugins (but not update).
So deactivating that conflicting plugin enabled me to update it to the just released new version.
After activating the new plugin version the previous errors were resolved.

[Presskopp]

Thank you for your explanation. So it's not a core issue and the ticket can be closed.

[swissspidy]

Removing milestone from closed ticket.