Hi, Qusro Qader
Your PIN appears to be working: the first screenshot shows Windows asking for it, while the second says the account was added to Windows but could not be registered for Windows Hello. That points to a problem with this account’s app sign-in, not proof that your existing PIN is broken.
Here are some suggestions you can try:
Open Settings > Accounts > Email & accounts and check Accounts used by other apps. If the email you use for Clipchamp is listed there as an additional account, remove that entry, then reopen Clipchamp and sign in again. Don’t remove the account you use to sign in to Windows; removing an app account may also sign it out of other apps.
Open Microsoft Store > Library > Get updates to update Clipchamp. Then go to Settings > Apps > Installed apps > Microsoft Clipchamp > Advanced options and select Repair, if available. Avoid Reset for now, especially if you have projects whose original media files are only on this PC.
If it still stalls after the PIN, try signing in while connected to a different network, such as a phone hotspot. That can help narrow down whether the connection is interrupting the sign-in process.
Thank you for your patience in reading, I hope this information has been helpful to you.
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