Can't send text to confirm suspicious payment

[westy02]

Today when i've tried to purchase something
I've got this text message:

Paypal A -[amount] GBP transaction with xxx  on 17 April 2018 was marked suspicious. Please reply "1" if authorised or "2" if not authorised.

So i've texted "1" to authorise but text won't send and message is Paypal(62226) message Unsuccessful

how do I authorise this payment if I can't send text

Thanks

So how can i turn this off, or how can i authorise?
Btw it show as completed under my "Activity".

Can somebody help me?