Hello @za ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
You can use Virtual WAN to connect a VNet to a virtual hub in a different tenant but connecting a Hub in a VWAN in VWAN A to a Hub in VWAN B via the normal VWAN hub to hub mechanism is not currently supported today.
Doc for connecting cross-tenant VNets to a Virtual Wan hub : https://video2.skills-academy.com/en-us/azure/virtual-wan/cross-tenant-vnet
I reached out to the Virtual WAN Product Group team and they would like to know the business reason for this requirement like more details on your setup & why you would want to connect hubs in two separate VWANs, so that they could explore options going forward. If you could share these details, I can discuss this feature request with the team internally.
If you wish you may also leave your feedback in the below forum requesting this feature. All the feedback you share in these forums will be monitored and reviewed by the Microsoft engineering teams responsible for building Azure.
https://feedback.azure.com/d365community/forum/8ae9bf04-8326-ec11-b6e6-000d3a4f0789
Kindly let us know if the above helps or you need further assistance on this issue.
----------------------------------------------------------------------------------------------------------------
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.