I have run into this situation twice recently. I have clients set up for unattended access with GoToAssist. Other providers of service (their CPA firm in one case, a point of sale vendor in another) also uses GoToAssist and came in and installed unattended support in place of my setup. Consequently those devices now show as REMOVED in my account and have rendered them unavailable to me.
Is there some way for more than one provider to use GoToAssist on a PC? Both of these scenarios are legitimate needs for all three parties (me, the client and the other vendors).