Digging up an old thread, since it describes almost exactly the problem I have.
Mautic and n8n v. 220.0 Oauth2 times out after the set “Access token lifetime (in minutes)”.
Tested one commercially provided Mautic and a self hosted, with the same result. On the commercial I cannot change basic auth, but on the self hosted it is enabled. The account is connected, but fails after the token lifetime with a 401 - if reconnected it works again.
This thread seems simliar: https://community.n8n.io/t/oauth2-token-not-getting-refreshed-throwing-401-after-expiry/ - stating that it is since version 220.0 - I haven’t tested to downgrade.
@RicardoE105 do you think your fix from here has been reverted?