Recently, I was migrating MX records from WIX to AWS. I was using GSuite and I was unable to do the same.
Then after a little bit of research, I found this stackoverflow link, which helped me resolve the problem.
Here is how you should be adding the records in AWS.
Record Name: @
Record Type: MX
Value: <Priority> <Route Traffic to>
example: 10 aspx.alt1.google.com
And if you have multiple records, simply add the records in the same text area in the new line and no commas.
This will resolve your problem. :)
