I was not able to find the switch to be able to uncheck the "Allow requestors to approve their own changes".
There is no switch for update policy.
$requiredReviewer = az repos policy required-reviewer create --blocking true
--branch "main" --branch-match-type "exact"
--enabled true --repository-id $($repositoryid)
--required-reviewer-ids $reviewerGroupId --org $adoOrg
--project $adoProject `
--message $reviewerMessage

Document Details
⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.
I was not able to find the switch to be able to uncheck the "Allow requestors to approve their own changes".
There is no switch for update policy.
$requiredReviewer = az repos policy required-reviewer create
--blocking true--branch "main"
--branch-match-type "exact"--enabled true
--repository-id $($repositoryid)--required-reviewer-ids $reviewerGroupId
--org $adoOrg--project $adoProject `
--message $reviewerMessage
Document Details
⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.