The Issue
You receive the error The username you entered is already being used... or Please make corrections to the following fields... while attempting to register for a new Stamps.com account.
The Cause
Your web browser's temporary files are interfering with the registration process.
What to Do
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Delete your web browser's temporary files. Then, try again to complete the registration process.
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If you are still unable to register there may be a problem with your web browser. Try registering for an account using a different web browser such as Edge, Firefox, Safari, or Chrome.
If this did not solve your problem, please contact Customer Support.