If you cannot see an employer in the manager dropdown of the employer organisation, and have confirmed that the manager is linked to the correct employer group, it may be due to the group hierarchy. If the employer holds a higher group hierarchy than your own, you will not be able to view the employer in the dropdown menu.
Please modify the employer's group structure to include only the groups assigned to the learners, or alternatively, kindly ask an admin with a matching group structure to designate the employer as the manager for that learner.

Admin’s group structure:

Employer’s group structure: