Information
For security purposes, Zoom has a few requirements that your passcode must meet. As per passcode requirements, have at least 1 letter (a, b, c...). This shall make the passcode strong.
Rationale:
Solution
Go into the Zoom Admin Dashboard on the zoom website. Account Management -> Account Settings -> Security -> Passcode Requirement -> Have at least 1 letter (a, b, c...), and ensure it is set to enabled.