I need more context to answer that.

You didn’t say which band.

Without a band name, it’s impossible to know which single you’re talking about. Hundreds of bands have had first international singles that flopped. If you tell me the band, I can look it up or give you my best guess.

That said, if you’re trying to find a forgotten single, check Wikipedia’s discography page for the band and look for the earliest release that didn’t chart in any major market. Most bands have at least one.