I ran into this when creating a Safe Links policy and the fix was to remove all the spaces from the Policy Name (even though the default policy name has spaces in it). Makes no sense, but it worked in my case.
Safe Links creation fails for unknown reason
However I try to create Safe Links policy in M365 Defender, I always get this unknown error message.
6 additional answers
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Aholic Liang-MSFT 13,861 Reputation points Microsoft Vendor
2023-02-21T02:45:16.7366667+00:00 Hi @Pavel yannara Mirochnitchenko ,
Please check whether the account has the following role permissions:
1. A member of the Organization Management or Security Administrator role group in the Microsoft 365 Defender portal
2. A member of the Organization Management role group in Exchange Online.
If your account meets the above conditions and still cannot create a policy, we recommend that you refer to the following link to configure a Safe Links policy with PowerShell for more detailed error information for our better research.
Set up Safe Links policies in Microsoft Defender for Office 365 - Office 365 | Microsoft Learn
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Pavel yannara Mirochnitchenko 12,621 Reputation points MVP
2023-02-21T06:17:33.9733333+00:00 I don't know what happend, but in few hours I tried again and it worked.
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Aholic Liang-MSFT 13,861 Reputation points Microsoft Vendor
2023-02-21T08:19:54.9833333+00:00 Hi @Pavel Yannara Mirochnitchenko ,
Thank you for posting an update on this issue and I'm glad to hear that your problem was successfully resolved! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer.
[Safe Links creation fails for unknown reason]
Issue Symptom:I try to create Safe Links policy in M365 Defender, I always get this unknown error message.
Solution:
After a few hours, try creating the Safe Links policy again, and it works.
You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks!
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Pavel yannara Mirochnitchenko 12,621 Reputation points MVP
2023-02-28T06:25:26.44+00:00 This happends again. I decided to delete pilot policy and create new one for entire organization, it then failed. I tried again to create new policy only for me, it fails as well.