I had the same issue you had with Easysolar getting greyed (grayed) out in Victron Connect
I used the ‘Reset’ button on the panel of the EasySolar unit (you have to press it with a pin through a hole). Once this was done it accepted the Bluetooth PIN as printed on the label on the panel and all was good.
I now have an issue that I cannot activate ‘Ignore AC Input’ so if you have any ideas on that i’d love to hear them!