AddAndCustomizePages permission is required to update view CAML
Access Denied.
There is a permission restriction that has been implemented in Office 365 that denies anyone permissions to the AddandCustomizePages permission level. This permission level is directly related to the Scripting Capabilities feature of Office 365 and has been disabled by default for security purposes.
1. Download and Install SharePoint Online Management Shell
2. Run SharePoint Online Management Shell as an Administrator
3. Execute the following commands to enable the AddandCustomizePages permission level on the site collection in Office 365, then attempt the migration again:
Connect-SPOService -Url https://domain-admin.sharepoint.com
Set-SPOSite https://domain.sharepoint.com/sites/SiteCollectionName -DenyAddAndCustomizePages 0
Note: Replace domain and SiteCollectionName accordingly, for example: Connect-SPOService -Url https://QuestSupport-admin.sharepoint.com and Set-SPOSite https://QuestSupport.sharepoint.com/sites/SupportSite -DenyAddAndCustomizePages 0
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