MC259297 – As outlined in MC243041 (March ’21) Microsoft will be retiring support for tenant background images. Instead Microsoft recommends the utilization of the improvements they have made to Organizational Theming.
Note: If you organization is not using tenant background images you can safely disregard this message.
Key points:
How this affects your organization:
Once this change is implemented tenant background images will no longer be supported.
What you need to do to prepare:
If your organization is using tenant background images Microsoft recommends utilizing Organizational Theming.