Monday.com CRM email tracking not delivering email

When enabling email tracking in CRM, emails are not being delivered. Any suggestions?

Message in ‘failed’ receipt is:
Remote Server returned ‘550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to Email non-delivery reports in Exchange Online | Microsoft Docs AS(7230) [CWLP123MB2739.GBRP123.PROD.OUTLOOK.COM]’

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