My Cloud Mirror - Volume Usage Warning

I got following warning: Volume Usage is Above 95%
“Your volume 1 usage is close to full capacity…” Error 1001

But why do I get this warning, as my capacity shows 904 GB free out of 2 TB?
I have a share for backup which is 942G but it’s still far from my 2 TB capacity.
Help to get rid of the warning is appreciated.

RAID Volume: Volume_1 RAID 1 1.96 TB Good
Disk Status: Drive1 2 TB Good, Drive2 2 TB Good

Firmware Current Version 2.21.126

When and where do you get this particular error message? Using the Desktop app? Within the Dashboard?

Thanks for answer.
I got the message as “WD App Manager Notifications” every time Windows 7 startup.

Perhaps it would be best to E-mail WD Support about this. You can do so in the following link:

Try to provide as many details as possible related to the issue at hand. They may need additional information for investigation purposes.

At least, many thanks for the answer, I will consider creating a support case.