Odoo GMAIL extension

[c13ply]

Hello,
I've got problem with connecting Gmail Odoo extension with Odoo 16e on custom domain.

Mail plugin is enabled.
Appsscript.json URLs contain my custom domain. I did everything as described: https://www.odoo.com/documentation/16.0/applications/productivity/mail_plugins/gmail.html

but the plugin can not connect the odoo.
Please help fix the issue