Thank you for posting, Ares.
I'm sorry for the difficulties you are having with managing your subscriptions, and I appreciate your long-term use of Adobe's different services.
This error can occur when a redemption code does not match the country/region associated with the Adobe account or when the code is not intended for the specific subscription being activated.
Since you're located in Armenia, please make sure the Substance 3D Collection redemption code was purchased for Armenia and is intended for the Substance 3D Collection plan. If the code was purchased for a different country or product, it may not activate successfully.
If you're adding a redemption code to an existing subscription, please review: Redeem a code on an Adobe account with an active subscription.
I also noticed there may be a billing issue affecting one of your subscriptions. If a payment was missed, updating the payment method may help restore service. You can find steps here: https://adobe.ly/4q62nC2.
Please update this public discussion thread if you have any additional questions, Ares. ^JW