Can't register new tables

[OscarSNM]

2 weeks ago I wanted to see what Scorebit was like and I installed the application on my android phone. I registered my username, created my venue and added my first vpin (Iron Maiden). It took a while but I did it, played a few games and wanted to try another one. Guardians of the Galaxy. It cost a bit more but I managed to get it running. From that moment on, I couldn't register any more vpin. I already tried with Blood Machines (doesn't show the QR but I found it in a folder and it doesn't register the table), Aerosmith (scans the QR without success) and the last one I tried was Total Nuclear Annihilation with the same result. I tried scanning and selecting my venue but they don't show up on the list. I wanted to add them manually and scan the QR from the Tools of each table, but the Pairing gives me error. In the midst of all this, I play my two registered machines with no problems. In fact, in the GOTG I am in the top 10 on the VPUniverse Leaderboard, but these 3 boards there is no way to get them to work. Does anyone have any advice to give me?