Couldn't reedem 100GB Google Drive free storage

Please tell us some basic information before asking for help:
- Model Name: ZE551ML
- Firmware Version: LRX21V.WW-ASUS_Z00A-2.20.40.206_20170627_2131
- Rooted or not: Not rooted
- Frequency of Occurrence: Always
- APP Name & APP Version (If your issue relates to the app): Google Drive 2.19.412.05.75
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Hello,
I have been using my Asus Zenfone 2 for a while and never noticed that I was entitled to redeem 100GB of free storage on Google Drive until recently when I have restored my phone to factory settings. Unfortunately, when I entered my gmail account I received an error message that the offer cannot be redeemed with my account and to try with another one (see screenshot). I've tried with a second account but got the same error. Let me tell you that this is the first time I tried to redeem the offer.
Can you help me understand what kind of account should I get to redeem the storage?
Thanks
Comments
This service has expired on 2020/03/29 and cannot be redeemed.
That's a shame. I have been using the phone for 3 years but I've never been notified about this benefit until I reset the phone to factory settings a few days ago.
On the other hand I have been receiving regular emails with ASUS Webstorage offers and monthly payment.
I am disappointed