Error: Tenant to Tenant Migration through PowerShell

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I was performing Microsoft 365 Tenant to Tenant Migration and stuck in between. I am getting error in creating Organization relationship error in source tenant.

I tried process multiple times from the scratch, now I am fed up with this. If someone can help me, it would be great.

The command, I was running is:

$targetTenantId = "[tenant ID of your trusted partner, where the mailboxes are being moved to]"
$appId = "[application ID of the mailbox migration app you consented to]"
$scope = "[name of the mail enabled security group that contains the list of users who are allowed to migrate]"
$orgrelname = "[name of your new organization relationship]"
# Enable customization if tenant is dehydrated
$dehydrated = Get-OrganizationConfig | select isdehydrated
if ($dehydrated.isdehydrated -eq $true) {Enable-OrganizationCustomization}
if (!(New-DistributionGroup -Type Security -Name $scope)) { Write-Host "Group already exists." }
$orgrels=Get-OrganizationRelationship
$existingOrgRel = $orgrels | ?{$_.DomainNames -like $targetTenantId}
If ($null -ne $existingOrgRel)
{
    Set-OrganizationRelationship $existingOrgRel.Name -Enabled:$true -MailboxMoveEnabled:$true -MailboxMoveCapability RemoteOutbound -OAuthApplicationId $appId -MailboxMovePublishedScopes $scope
}
If ($null -eq $existingOrgRel)
{
    New-OrganizationRelationship $orgrelname -Enabled:$true -MailboxMoveEnabled:$true -MailboxMoveCapability RemoteOutbound -DomainNames $targetTenantId -OAuthApplicationId $appId -MailboxMovePublishedScopes $scope
}

I was doing it with the video, earlier I have done this successfully but now I am totally stuck in the process.

Here is the video resource that I am watching: https://www.youtube.com/watch?v=x0etGrlWjzE

Let me know if anyone has leads on this. Looking for quick solution if possible. I do not want to go with the third-party migration solutions.

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