How to convert a point to polygon

You could use the Bufferer, which will create a circle polygon around each point.

Update - I seem to get both of them rejected with these values

Could you share your log file?

I can't really due to the folder and feature names, but with the bufferer bit, it returns this. No errors etc, just to rejected -

2022-08-23 14:05:39|  0.3| 0.0|STATS |Bufferer_BUFFERED Feature Counter -1 2147614888 (TeeFactory): Cloned 0 input feature(s) into 0 output feature(s)

2022-08-23 14:05:39|  0.3| 0.0|STATS |Bufferer_<REJECTED> Feature Counter -1 2147680424 (TeeFactory): Cloned 2 input feature(s) into 0 output feature(s)

2022-08-23 14:05:39|  0.3| 0.0|STATS |Destination Feature Type Routing Correlator (RoutingFactory): Tested 0 input feature(s), wrote 0 output feature(s): 0 matched merge filters, 0 were routed to output, 0 could not be routed.

Are your points 2d? According to the documentation the rejected port is for non-2d features. If you want the translation to continue regardless of the rejected features, you can change the parameter in the screenshot below to Continue Translation. Sometimes you can glean more information about the rejection if you let the translation continue through.

It does continue on rejected features - appreciate the help though, seeming to struggle with the simplest of bits!

Edit - had a change round and chose "ground units". Got it working! Thank you