"Please contact iTunes support to complete this transaction"
Cant sign in
[Edited by Moderator]
iPad (10th gen) WiFi, Cellular
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You need to have a payment method on file.
See -> Payment methods you can use with your Apple ID
Payment methods you can use with your Apple ID – Apple Support (UK)
If you don't have a credit card or don't want to use a credit card, you can also use your Apple ID balance as payment method, see -> Add money to your Apple ID balance
Add money to your Apple ID balance – Apple Support (UK)