Going crazy with gmail…

Freepbx postfix works fine with gmail smtp accounts in port 587 even without admin pro.
I’m not able to get it working with a particular pbx.
Same postfix config as others, it gets “authentication required’ error.
The same gmail account works fine with other pbx with same postfix settings on different locations (different public IP).
Of course, gmail account has been created and verified with a browser in the same local subnet as non-working Pbx (less secure apps enabled , etc etc ).
The same pbx works fine with other gmail accounts.
I don’t know what else try….
Any suggestion ?
Thank you

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