When i try to disable an online user，it shows “license validatiob error”
Do you mean you want to disable Skype for Business Online user?
If so, this issue occurs because the appropriate license isn't applied to the user. Therefore, the action fails with a license validation error.
To resolve this issue, apply the correct license, and then try to disable the user again. For Skype for Business Online, an Exchange Plan 2 license or higher is required.
For more details, you could refer to this article.
If I misunderstand your words, please give us more details. Thanks for your understanding.
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