Hello Madhubhanie Senadheera,
First of all, thank you very much for your feedback.
You described us 2 different issues with coordinates API.
1. Unexpected error, please try again later:
This was a bug in the code. We fixed it: Now this URL should work fine
2. Can not find coordinates for accession:
We investigated it and noticed that these UniProt accessions were not loaded by our import procedure. For it, we opened a ticket and as soon as we get a resolution date, we will let you know. Unfortunatelly this is not a quick fix like the first one.
Thank you very much for your feedback. I hope I have helped a little bit.
Best Regards
Leonardo Gonzales