signature images in emails are currently displaying as question marks

Super frustrating! I’ve noticed that all signature images in emails are currently displaying as question marks rather than the actual images.

Could you please let me know why this is happening and whether there’s anything that needs to be updated or fixed to resolve it?

I am using a iMAC New outlook Tahoe 26.3.1

This is the error message that comes up:

This add-in is a part of CodeTwo Email Signatures 365 - a solution for central management of email signatures, disclaimers and branding. If you want to use this add-in, your Microsoft 365 organization first needs to be registered in CodeTwo Admin Panel by a global admin.

Your IT must update the CodeTwo Add-in to let it keep adding signatures and to reduce user sign-in requests. ***

[Edited by Moderator]