Unable to install third-party add-in in Excel – Permission Error

Question

Unable to install third-party add-in in Excel – Permission Error

Bernat Guirao 15

Hello,

I am a Microsoft 365 personal subscriber and I am experiencing an issue when trying to install the "Claude by Anthropic for Excel" add-in from the official Office Store.

When I attempt to install it, I receive the following error:

"You don't have permission to use this add-in. Contact your system administrator to request access."

I have already checked the following:

Trust Center settings in Excel: all add-in options are enabled and nothing is blocked
My Microsoft account privacy settings: Claude does not appear under "App access" in my account
I tried installing from Insert → Get Add-ins directly in Excel, and I receive "Error loading add-ins – One or more add-ins failed to load"

This is a personal Microsoft 365 account, not a business or organization account, so there is no system administrator to contact.

Could you please help me enable third-party add-in access for my account?

Thank you very much for your help.

Ruud van der Ham 5 Puntos de reputación

2026-05-30T15:22:54.6366667+00:00

I have exactly the same problem since yesterday (29 May 2026).

I found a work around by using a different account, but still using the origina;l subscription.

It looks like it's a Microsoft problem. I hope it will be solved soon!
Daniel Gomez Duque 0 Puntos de reputación

2026-06-01T16:32:50.69+00:00

Same thing, June 1 , excel add in is not loading and its throwing me an error every time. I already tried everything,

don´t know what to do.

5 respuestas

Su respuesta

Ruud van der Ham 5 Puntos de reputación

2026-05-30T15:22:54.6366667+00:00

I have exactly the same problem since yesterday (29 May 2026).

I found a work around by using a different account, but still using the origina;l subscription.

It looks like it's a Microsoft problem. I hope it will be solved soon!
Daniel Gomez Duque 0 Puntos de reputación

2026-06-01T16:32:50.69+00:00

Same thing, June 1 , excel add in is not loading and its throwing me an error every time. I already tried everything,

don´t know what to do.

Answer 1

SD - IA 181.1K Asesor independiente

Hi,
This is super strange, although MS office is your Personal subscription but may I know if a Work or school account is added in Settings > Accounts > Access Work or school?

Additionally, Please open Credential Manager > Windows /Web credentials, do you see any Work account credential listed?

I’m eager to hear back and work together to find a solution.

AtoZ-PabloHernandez - Business Efficiency 0 Puntos de reputación

2026-06-02T10:17:39.41+00:00

Don't think it is subscription related I have exactly the same issue on a Office 2021 Pro Plus V2605 Build 20026.20112 licensed installation. However my PC at the same office using the same version is running the add-in with absolutely no issues. So is not even a generalised issue, seems to be a random blockage on some accounts.

Answer 2

Ruud van der Ham 5

I have exactly the same problem since yesterday (29 May 2026).

I found a work around by using a different account, but still using the origina;l subscription.

It looks like it's a Microsoft problem. I hope it will be solved soon!

Enrique Calderón 5 Puntos de reputación

2026-05-30T16:04:37.16+00:00

Hi Ruud, I have exactly the same problem. Could you please explain the workaround you found? What do you mean by 'using a different account but still using the original subscription'? Thank you! mean while, waiting the mocrosoft`s solution...
Ruud van der Ham 5 Puntos de reputación

2026-05-30T16:13:19.58+00:00

Just use a different Microsoft account (maybe you need to create one), Then logout in Excel from the orignal account and logn to the other one. It seems to still remember the original account that has the subscription.

Not very elegant, but an acceptable work around.

BTW, the problem is really Microsoft accout related, as I experienced the same problem on a different PC (under the same account).

Let's hope things will be sorted quickly.
bablu ullah 0 Puntos de reputación

2026-05-30T18:32:53.2433333+00:00

Hi, I have tried signing in with a different account but still come up with the same error. Is there any particular sequence of steps you followed.
Ruud van der Ham 5 Puntos de reputación

2026-05-30T18:48:24.32+00:00

No, nothing special. It's a really weird problem.

Answer 3

Willian Brunno Azevedo 0

Same problem here. I've noticed that using Claude's Add-in for Excel Online works fine, but with the native app, this problem persists. Hope Microsoft fixes it soon.

0 comentarios

Answer 4

Ruud van der Ham 5

Microsoft, Are you listening, or -more importantly- take action?

0 comentarios

Answer 5

Ruud van der Ham 5

It looks like the problem is solved. Hooray!

0 comentarios