550 error to Authenticate with Google Workspace Split Delivery

[ladyt123]

Hello, I have an issue with DirectAdmin server that hosts 2 email addresses while the rest of the email addresses are handled through Google Workspace. I've changed the MX records directing to Google Workspace. I created a split delivery in Google Workspace as instructed and no matter what I do I still get the same 550 Error. For some reason DirectAdmin rejects it, MXtoolbox shows the SPF is working DKIM and DMARC is good but when I send an email to one of the email addresses that is hosted on this server it's rejected. How can I get it to stop rejecting the same email from the same domain? Any help regarding this matter will be greatly appreciated. Hot Deals Support seems to be not so helpful.

Thank you
Tanesha