I have successfully created an application on linkedin, but when I try to copy client_secret, I receive the following message. At the same time, the Callback url displays this message
AI-generated summary
The discussion revolves around an issue with LinkedIn’s OIDC client secret validation, where users report errors when copying the secret. hoangphuctran93 notes that the secret contains characters not allowed in the new format, suggesting LinkedIn has updated its security policies. Ted advises checking for non-alphanumeric characters or whitespace in the copied secret. hoangphuctran93 confirms the change and references a fix in a GitHub pull request here, which was acknowledged by Ted and appreciated by hoangphuctran93.
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Hello, @hoangphuctran93!
Without sharing your client secret, please check if it contains any symbols that are not a-z, A-Z, 0-9. If it does, let me know here what character it is. 
As far as I understand, the secret should only
ever contain alphanumerics. One possibility is that a space or line-break was included when you copied the code.
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I think LinkedIn has made some updates regarding security code allocation. and as you said they contain .
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Thanks! I regenerated a secret on my own app, and they have indeed changed. Fix is here:
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Thank you and your members for your timely updates to the community.
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