Hi Tayo Taiwo
The error message you are encountering indicates that there is a missing policy parameter in your Azure Landing Zone Accelerator deployment. Specifically, the policy assignment 'Enforce-RegComp-wam57en7' is missing several parameters as defined in the policy definition. To resolve this issue, you should ensure that all required parameters are correctly specified in your policy assignment.
You may want to review the policy definition and confirm that the parameters such as 'operationName', 'MembersToExclude', 'allowedEncryptionSets', and 'virtualNetworkId' are correctly set. If any of these parameters are missing or incorrectly configured, it could lead to the deployment failure you are experiencing.
https://learn.microsoft.com/en-us/industry/nonprofit/azure-landing-zone#troubleshoot
Kindly let us know if the above helps or you need further assistance on this issue.
Please do consider to “up-vote” wherever the information provided helps you, this can be beneficial to other community members.