Hi,
This is definitely an issue on the Azure side, You have to allow communication between internal networks from your Big-IP, in the Restricted Src Address you have to specify the IP addresses of the network – the ones that are allowed to connect to the BIG-IP.
Review the next link to try to find the step that you miss in your azure configuration:
https://community.f5.com/t5/technical-articles/create-a-big-ip-ha-pair-in-azure/ta-p/282837
Additional in this link you have all the information:
https://github.com/F5Networks/f5-azure-arm-templates/tree/main/supported/failover/same-net/via-api/n-nic/existing-stack/byol
Hope it´s work.
Nimbostratus
