New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

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Posted on by PhilJohnno

Beginning this morning, we are seeing errors under home page activities and user tasks. Err: Error: Invalid format of GUID string. The correct format of the GUID string is: CDEF7890-ABCD-0123-1234-567890ABCDEF where 0-9, A-F symbolizes hexadecimal digits.. Since this has started occurring without any specific environment changes, i assume it's something on the backend Microsoft. thanks in advance for any advice.

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Dynamics 365 Business Central

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PhilJohnno 29 on at

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New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

i appreciate all the responses. The issue was resolved once I did a reset on the personalization - only had to do for one person in our organization and it was resolved for all users after that. Weird problem and resolution. thanks, Phil

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YUN ZHU 91,318 Super User 2025 Season 2 on at

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New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

Does this problem occur when using the Super user?
Or does this problem occur when switching to other roles?

This error may be displayed when the user does not have sufficient permissions.

Hope this can give you some hints.

Thanks.

ZHU

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Vahid Ghafarpour 11,930 Super User 2025 Season 2 on at

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New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

Even if there haven’t been any specific environment changes, check for any recent updates or patches applied to your Dynamics 365 environment. Sometimes, backend updates can introduce unexpected issues.

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PhilJohnno 29 on at

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New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

i do not believe there is any customization on this page. But regardless, we have had no environment changes, so this seems to be something deeper.

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Gerardo Rentería Ga... 23,446 Most Valuable Professional on at

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New errors under home page activities and user tasks. Err: Error: Invalid format of GUID string.

Hi

Do you have any customization on these pages? This error appears if there is a formatting error.

Guid Data Type - Business Central | Microsoft Learn

Best

GR

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