You may be unable to join the Pocket Camp Club due to the following:
(1) You are already a member.
Only one save data file can be used to join per Apple ID.
If you are sharing a single Apple ID with other family members and one of them is already a Pocket Camp Club member, other family members will not be able to join. In that case, you will need to use a separate Apple ID.
Also, if there is still time left in the validity period of the Pocket Camp Club membership, even after canceling, you will need to wait until it expires to join again.
Note: If you would like to check your Pocket Camp Club membership status or validity period, please view the following FAQ:
・[iOS]How do I check my subscription status?
(2) There is a purchase restriction.
If your credit card has usage restrictions or a guardian/parent has set purchase restrictions, you will not be able to make the purchase.
Please review the details of your payment method.
(3) You do not have enough funds remaining in your balance.
Please try joining again after confirming your payment-method balance.
Note: "Not enough funds" may display even during a free trial membership.
(4) You have not scrolled to the bottom of the Notes section.
If you are unable to tap the Subscribe button, you may need to scroll all the way down to the bottom of the Notes section on the Membership screen. Please read the Notes to the end.
(5) A communication error or support code 802-0-025-06C-03C is displayed.
Try waiting for a bit or moving to another location with better reception, and then try joining again.