Gcal auto sync cron not working (but manual does)

Hello,
I have trouble with the “appointments_gcal_sync” scheduled cron job not working at all. At the same time the same cron job forced to run manually does the job of syncing. Other crons seem to run flawlessly.

OR: how to setup the sync function for the real cron? Apparently running the wp-cron.php is not working for the sync.

Notice: either the manual run on Cronjob Scheduler, or Advanced Cron Manager works well, BUT using the WP Control (as suggested here: https://premium.wpmudev.org/forums/topic/gcal-synchronization-and-cron-job ) to force the cron manually seem to not trigger it properly (it doesnt sync, though the message of succesful run appears)

My settings, and what I already tried:
– credentials seem to be fine as adding events through page adds proper event in GCal;
– also manual importing by the button “Import and Update events from GCal” works fine;
– both ways sync is set;
– other crons work well, emails for reminders are sent;
– 2 calendars (my personal and the one for reservations), but the correct is set in the settings, and events appera in correct when done manually reservation, or the import.

Already tried the manual real cron on histing provider (ovh in Poland) for running wp-cron.php hourly, but it returns 0 in log, so it seems to run correct, but still not syncing….

Any suggestions?