Exchange Impersonation error 11021

A video on how to fix "Unable to open user mailbox due to impersonation error. Please make sure impersonation is set properly. (11021)"

Steps:
- Select the Permissions menu, then Admin Roles
- Create a new role by clicking on the + sign
- Give it a name e.g. GSuiteMigration
- Click on the + under roles and add the ApplicationImpersonation & ViewOnly-Configuration
- Click the + sign under members and add the admin that requires the impersonation role
- Save and rerun the migration steps

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[ralphpaet]

still getting same error even impersonation is added

[robbcornwall]

Error executing request. You don't have access to create, change, or remove the "...-GSuiteMigration" management role assignment. You must be assigned a delegating role assignment to the management role or its parent in the hierarchy without a scope restriction.

[JayDe-ux]

hi. keep getting this error "first must just an fyi

[Abdullah-iebn]

Hi Nichole, I followed the steps, but I received an error: "Error executing request. The command you tried to run isn't currently allowed in your organization. To run this command, you first need to run the command: Any suggestions?

[PRMM-vwnz]

Hello! Thank you for these videos - all really helpful! I had this error and then these steps fixed it. However, I'm now getting the below error instead. Do you know how to correct this by chance?

The source server is temporarily busy. If this continues, try reducing the number of concurrent requests under "Migration settings". (11028)