I don't think this one has a unique solution. I found a completely valid solution and the site rejected it. Is there somewhere i can send a screenshot?

I'm having another go because my first solution was rejected. I've just read the comment above so maybe there is more than one correct solution to this one?

Trial and error can get it down to the last few clusters. Think there are about 12 valid solutions in those last few squares.

Persistant guessing - got there in the end help to start:

R14C17.

Yes - creative solving required - nice result - thanks.

Rubbish, don't bother.

R14c17-18, r15c17-19, r16c18-19, r17c16
r23c2, r24c1

You can solve everything else.

Thank you to JunkyThrowy for the multi-answer clarifications. Would work MUCH better as a negative space puzzle.

Thank you.