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I'm having the same problem registering for TU Go.
I've recently switched over to pay monthly from pay & go so I could make use of this app, keeping my existing number. I spoke to CS yesterday who reset my account after 3 failed attempts (same code each time) and advised waiting 24 hours before trying again - today still no joy, although I did get a different code!
I've only tried once today and will wait another 24 hours before trying again and contacting CS if necessary. I get a good signal at home but at work struggle to get a 2G signal some days, dependng on the weather it seems, so TU Go would be useful as a backup.
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