Gsuite to Microsoft 365 - Error creating endpoint Looks like you do not have permission

I was working on migration and when I tried to create an endpoint I got:

"Error creating endpoint. Looks like you do not have permission".

I tested the communication using the Test-MigrationServerAvailability cmdlets and I got access denied.

Command:

>Test-MigrationServerAvailability -Gmail -ServiceAccountKeyFileData $([System.IO.File]::ReadAllBytes("C:\\Users\\Maykon\\Downloads\\office365migration.json")) -EmailAddress yourgmailsuperuse@contoso.com

 The problem was related to the Domain-wide delegation, I added this to the API Scope:

https://mail.google.com/https://www.google.com/m8/feeds,https://www.googleapis.com/auth/contacts.readonly,https://www.googleapis.com/auth/calendar.readonly,https://www.googleapis.com/auth/admin.directory.group.readonly,https://www.googleapis.com/auth/admin.directory.user.readonly,https://www.googleapis.com/auth/drive,https://sites.google.com/feeds/,https://www.googleapis.com/auth/gmail.settings.sharing,https://www.googleapis.com/auth/gmail.settings.basic,https://www.googleapis.com/auth/contacts.other.readonly,https://www.googleapis.com/auth/calendar,https://www.google.com/m8/feeds/,https://www.googleapis.com/auth/contacts 

After that, the Endpoint was created with success.

Source:
Migration from google g suite to office 365 - Error: MigrationPermanentException: The call to https://www.googleapis.com/oauth2/v4/token returned with status code Unauthorized: - Microsoft Q&A

MailTip - Exchange Online

These are the steps to configure the MailTip for external contact on Exchange Online.

In the exchange online:

Set-OrganizationConfig -MailTipsExternalRecipientsTipsEnable $true

Create a contact:

 

 In the PowerShell create a custom MailTip:

Set-MailContact -Identity "Maykon Gmail" -MailTip "Please! Check if this is the right USER"

In the Outlook, create a new message and select the contact: