wpform email notifications not being sent

I have followed every suggestion I’ve found online, with no solution. Emails sent through the contact form are sent, but I only receive notifications from test emails sent from wp, not from the contact page of my site.
Debugging information, which is mostly Greek to me: (I did ensure that client ID and client secret are correct.) I hope someone can make sense of this and help me.

Type Error
Date December 5, 2022 at 8:45 pm
Content
Mailer: Google / Gmail
{
"error": "unauthorized_client",
"error_description": "Unauthorized"
}
Source
WPForms

/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wpforms/src/Tasks/Actions/EntryEmailsTask.php (line: 63)

Backtrace:
[0] wp_mail called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wpforms/src/Tasks/Actions/EntryEmailsTask.php:63]
[1] WPForms\Tasks\Actions\EntryEmailsTask::process called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/class-wp-hook.php:308]
[2] WP_Hook->apply_filters called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/class-wp-hook.php:332]
[3] WP_Hook->do_action called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/plugin.php:565]
[4] do_action_ref_array called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/actions/ActionScheduler_Action.php:22]
[5] ActionScheduler_Action->execute called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/abstracts/ActionScheduler_Abstract_QueueRunner.php:65]
[6] ActionScheduler_Abstract_QueueRunner->process_action called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/ActionScheduler_QueueRunner.php:162]
[7] ActionScheduler_QueueRunner->do_batch called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-content/plugins/wp-mail-smtp/vendor/woocommerce/action-scheduler/classes/ActionScheduler_QueueRunner.php:132]
[8] ActionScheduler_QueueRunner->run called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/class-wp-hook.php:308]
[9] WP_Hook->apply_filters called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/class-wp-hook.php:332]
[10] WP_Hook->do_action called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-includes/plugin.php:565]
[11] do_action_ref_array called at [/home/u518493503/domains/hoperemainsonline.com/public_html/wp-cron.php:188]

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