Forum Discussion
Error loading add-ins. One or more add-ins failed to load. See your add-ins.
No matter which Office applications I use (Excel, Word, PowerPoint, etc.), if a try to install an add-in. I get the above error message. This happens with any add-in. Does anybody have a solution for this?
Thank you.
2 Replies
Seems this is a known issue where the add‑in catalog or local cache becomes corrupted or blocked, and it shows up as “Error loading add-ins.
Because every add-in fails across Excel, Word, and PowerPoint, investigate a shared installation or validation problem before blaming one add-in. Microsoft documents this exact installation message and notes that an incorrect computer date or time can interfere with validating an add-in’s manifest.
Close all Office applications, correct the system date and time, and then reopen one application. Reinstall one affected add-in from its trusted original source and test it before adding others. For a custom add-in, ask its publisher or developer to validate the manifest; you should not need to edit it yourself.
If the problem continues across unrelated add-ins, collect the Office build, operating system, installation source, and complete error text. Send those through Help, Feedback, Report a problem and involve your Microsoft 365 administrator. This message alone does not establish a tenant restriction or justify disabling security controls.
