August 2019
I went in with my geonosians in one battle and I started without the brute although I have both zetas on Brood Alpha. I then used both the ability to call in the Brute and the abitlity for the B2 rocket trooper droid and neither appeared. Summoning B2 in the other mission in the middle territory with my triumvirate worked fine. I also found another person on discord, who had the same issue using a sith empire team. In the screenshot you can see, that I just used both abilities.
August 2019
I had this exact problem as well. Phase 4 on the Wat Tambor Mission. Probably cost my guild shards. I couldn't post from my phone yesterday, but that's when it occurred.
Ally Code 932-358-145.
Would appreciate response.