@Yossi Cahen
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this!
Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer .
Refer to this Github Sample on how to work with video tile component in video call in ACS.
Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.