This is a bug in the new online immigration visa application process, and will stop any one applying the visitor visa.
Apparent the sponsor sharing ID format is different between the sponsor dashboard and the online visa application form. User will receive "Sharing ID is not a valid sharing ID"
The application form require user copy and paste the Sharing ID. However the ID will lost the last digit after paste, and user can not add the last digit due to limitation/validation of the filed.