Hi @tncylmz,
vCenter 7 U3  is not supported with Veeam orchestrator V4 up to now.

https://helpcenter.veeam.com/docs/vao/userguide/system_requirements.html?ver=40

thanks for quick respond :)

do you think that cause this problem ?

I cannot say this for sure, but you are trying to use an unsupported environment. Supported is vSphere 7 up to U1. Update 2 was a big step for vSphere and U3 is not a small update, too.
So, who knows what will happen in this case…

you are wright:) ı will try after downgrade vcenter and let you know 

Yikes.  Hopefully that gets an update soon as the last chapter of my v11 book is VAO.  

V7 U3 is not supported by VBR 11a either. So, no stress

No but it does work fine as I have it in my lab and backups are working. I have not updated my hosts to U3 yet until they update the USB NIC fling driver cause I use that so they will site on U2 until such time. 

Ok, interesting to hear that it works with 11a. But I will not use for real workloads until it is official supported.

VAO 5.0 is around the corner (a few weeks until release).

I‘m really sure that it will support 7.0 U3, if there is no issue in testing by QA. We will know when it is released :)

@tncy

Just to make sure - did you categorize any compute resources in Veeam ONE as describe din the help center ? Categorizing Resources - Veeam Availability Orchestrator User Guide

You can select the compute resources only based on Veeam ONE categorization which can be either manually created or be based on vSphere tags.