Hello @vamsitek,
Welcome to the PayPal Community! I'm sorry to hear you've run into some issues with your users logging into your PayPal account. Have you tried changing their username as well as their password? Also, are they logging in with their username or email address? Normally they should be logging in with their unique username / user-ID.
If you're still running into issues after that, please reach out to our Customer Support for further assistance.
Best wishes!
- Jon K
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