Go to the following link https://app.claimlane.com/find-users

Enter you email address

Click on "Retrieve accounts"

You will now get an email with a list of all email addresses that have access to Claimlane.
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Write to one of emails that are linked to Claimlane and ask them to invite you to their account.

If they forgot their password, they can find an article about how to reset their password here

For information about how they add you to their account, please go here