When the MiSP requests a Role Share, users in the Company Admin role will get an email to approve or deny that Role Share request. You will then log into your account, proceed to the User / Role Management tab in the left menu, and under the MiSP Role Share tab you will see the Role Share Request waiting for you to approve or deny.
Your options upon receiving a MiSP Role Share Request include:
Delete the Request (will persist once you have approved the request should you want to remove access in the future)
Approve the Request
Reject the Request
View Details: See the permissions they are requesting