No way To log in via Facebook or Google Oauth

[superdan77]

Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster

and phpBB 3.3.10 WITH PHP 7.3 FPM

There is NO way I can log in/register as a new user using Google OAuth or Facebook OAuth (I'm talking about native phpBB mode, no external plugins).
When I click on the buttons it sends me to the Facebook or Google login pages, I log in, then back to the phpBB login page without anything happening.
The FB and Google apps are correctly configured and the redirect pages are correctly configured.
The board login return url is (i.e. for Google)

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ucp.php?mode=login&login=external&oauth_service=google&state=11422c69ec1e22a0ef9e0e203f24a92c&code=4%2F0AbUR2VPhzsTahYO-1NGVwIZvNbAC7zMKnsQaUGY7kQjAYLJwLUuZsUKwORH4zXwYKPFAuw&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+openid&authuser=0&prompt=consent

but absolutely nothing happens.
also it gives me an error in the login page:

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Si è verificato un errore durante l’elaborazione della tua richiesta OAuth.

but it is really too generic to understand what went wrong. In addition, the Apache2 logs report no related errors ( the only error is about a phantomatic cron not found in root).

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51.158.230.211 - - [28/Apr/2023:16:36:08 +0200] "GET /ucp.php?mode=login&login=external&oauth_service=google&state=7ceb2551f2cdff14ec69037badba2bd9&code=4%2F0AbUR2VNLRRWfisbxVfdejn6jizEgqMjY7Dr0aoRgOK3kkF5F8taNrwUSY7XNr2n4_0tZuA&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+openid&authuser=0&prompt=consent HTTP/1.1" 200 10852 "https://accounts.google.com/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36"

==> /var/www/www.myforum.it/var/log/error.log <==
[Fri Apr 28 16:36:08.441678 2023] [negotiation:error] [pid 11123] [client 51.158.230.211:46916] AH00687: Negotiation: discovered file(s) matching request: /var/www/www.myforum.it/web/cron (None could be negotiated)., referer: https://www.myforum.it/ucp.php?mode=login&login=external&oauth_service=google&state=7ceb2551f2cdff14ec69037badba2bd9&code=4%2F0AbUR2VNLRRWfisbxVfdejn6jizEgqMjY7Dr0aoRgOK3kkF5F8taNrwUSY7XNr2n4_0tZuA&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+openid&authuser=0&prompt=consent

==> /var/www/www.myforum.it/var/log/access.log <==
51.158.230.211 - - [28/Apr/2023:16:36:08 +0200] "GET /cron/cron.task.core.tidy_search HTTP/1.1" 404 458 "https://www.myforum.it/ucp.php?mode=login&login=external&oauth_service=google&state=7ceb2551f2cdff14ec69037badba2bd9&code=4%2F0AbUR2VNLRRWfisbxVfdejn6jizEgqMjY7Dr0aoRgOK3kkF5F8taNrwUSY7XNr2n4_0tZuA&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+openid&authuser=0&prompt=consent" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36"

No javascript console log errors too

Thanks