Custom scripting is enabled and I did create the web part page using the URL provided, still received the same error.
I was able connect to the tenant via PowerShell and run the commands
Connect-SPOService -Url “https://<tenant>-admin.sharepoint.com”
Set-SPOSite -Identity <url> -DenyAddAndCustomizePages $false
I was then able to get the installer to function and load into DFFS successfully.
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This reply was modified 3 years, 6 months ago by Tim Miller.