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PowerAppsHostingSdk error only on form tabs with Timeline control

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Posted on by MM-16101356-0

I have a large model-driven app that's been deployed to a client. One user has been receiving the attached error message (PowerAppsHostingSdk) since the big outage at the end of October.

The most notable thing is that it's only occuring for one user. The second is that it only appears on tabs of forms with a timeline control. For example, when you load a contact record, the default tab is Summary (shown below), which does NOT have a timeline. When switching to Contact Details (which does have a timeline), it throws the error. This is true across both standard and custom tables.

The dev console didn't give me any additional error codes or messages.

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Error handling

2025_12_02_10_20_...

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Michael E. Gernaey 53,353 Super User 2025 Season 2 on at

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Hi @MM-16101356-0

Anytime you have a single user impacted you have a few things in order

1. Caching issue. Ask them to clear their cache and run in a new browser is possible and go incognito or private (to validate) after they clear their cache it should be good (make sure to clear all caches, browser/local) as Dataverse specifically uses these for items and its also the #1 reason that Power Automate will do something similar (happens to me) where I cannot load Power Automate as my local storage cache is corrupted.

2. I highly doubt you changed anything security wise but that is #2

Let me know if this doesn't help and we will move to phase 2

oh, btw you can always run Live Monitor if 1 or 2 doesn't help (I think 1 will), so that you can capture better errors.

If these suggestions help resolve your issue, Please consider Marking the answer as such and also maybe a like.

Thank you!
Sincerely, Michael Gernaey

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MM-16101356-0 17 on at

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Thanks so much for your help on this! Cache refresh works on every instance. I just wish we could find the root cause of why it keeps coming back for the user.

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Michael E. Gernaey 53,353 Super User 2025 Season 2 on at

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Hi @MM-16101356-0

If its always for the same user(s), it could be honestly a combination of things

1. The browser they are using

2. The corporate DLP or other policies on what their browser is allowed to do

3. It could be their settings, you may want to change their settings in their browser up a bit to clear cache more often. It will make them log in more, but its the trade off

4. Sometimes it can be if the user doesn't use it much, it can take longer because their credentials are essentially wiped or their connectors if any and it comes out like a cache issue but its really a cache security auth issue

5. It "sometimes" works if they just use Incognita all the time so there is no cache built up, again a bleh solution but it can help

Edge, Chrome, Firefox, norton, Safari all treat their caches differently so it could be the actual browser.

I wish I had a better solution

oh lastly, it can etake upwards of 24 hours (which I am sure you already tested) before a person's version refreshes

and lastly, it can be as ugg as you have to remove the app totally, (for the tenant, wait... a bit.. then re-install it forcing a cache hit, if you can force some settings changes like a Version it can also help.

Cheers!!

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