after having no problems whatsoever with the tubeless set up on rear I decided to change the tyre. Bought another compatible tyre and fitted it only for it not to seal or hold air. Fitted a new valve and checked tape, tyre stays up for about 20 mins. Bead seated perfectly on rim.
Got about 60ml of continental revo sealant and cant see any bubbling out.
What am I doing wrong??

put it in the bath to see where its leaking from?

Appears to be coming out of a couple of spokes, must mean the rim tape has failed?

This ^ or cover it in soapy water and see where bubbles up

EDIT: damaged the rim tape when putting on he new tyre perhaps?

might be a case of start again and re do the rim strip!