Salesforce Credentials have requirements in both Trailhead and Webassessor. To update your status for these credentials, you will need to link your Trailhead and Webassessor accounts. For full instructions and requirements, please see Link Your Trailhead and Webassessor Accounts on Salesforce Certification.
Refer this link for how to connect
https://trailhead.salesforce.com/connect-webassessor?lang=en
Salesforce Credentials have requirements in both Trailhead and Webassessor. To update your status for these credentials, you will need to link your Trailhead and Webassessor accounts.
For full instructions and requirements, please see Link Your Trailhead and Webassessor Accounts on Salesforce Certification.
https://help.salesforce.com/articleView?id=000270291&language=en_US&type=1