Access or verification is not possible on Veeam B&R with MFA enabled.
On Veeam B&R without MFA, access and checks are possible.
In Veeam, MFA can be disabled for service accounts.
https://helpcenter.veeam.com/docs/vbr/userguide/mfa.html?ver=13
Accordingly, there should be a way—in the check settings or otherwise—to define the user account used to access Veeam B&R.