I have been locked out of my Zoho Books account since i changed my mobile phone over.  I can get the OTP through the ZOHO Books software but i cant confirm using my phone app as nothing appears to authorise.

I need to know how to register/set up my new phone to work with the App and if i cant do that i have to re-establish an entirely new set of (ZOHO) Books but i cant currently do this as ZOHO (correctly) states that I already have an account (which i cant access).  Very frustrating