nostore extension on safari.
Discussion
After some investigation, the problem isn't associated with your wallet balance; the returned error message just doesn't reflect all failure cases. The listing you were testing on either:
1) Doesn't have a supported/valid currency,
2) is less than 1 sat,
or
3) the Alby exchange rate API failed to return a value due to latency, network, or timeout issues
Ah ok that makes sense, I'll try a higher balance with a better connection and see if that works.