Time Machine can't connect/use shared network volume

Hi All,
I have a Mobius2 external USB hard drive connected to my iMac (10.9.5). It has two partitions (Disk Utility 13 does not seem to allow more that 2 partitions now), one partition is for Time Machine backups of my iMac. The 2nd partition (as required by Time Machine is a shared AFP volume). I want to backup my MacBook (10.9.5) but I can't get Time Machine to use the partition I set up for it on the Mobius2. Even though I have the volume (named "Mobius RAID 2") mounted on my MacBook desktop, and I added it to Time Machine (entering both the password to connect to the iMac the Mobius is connected to and the password to encrypt the backup with) I still keep getting the error below!
"Time Machine couldn’t complete the backup to “Jeffrey’s iMac”.
The network backup disk could not be accessed because there was a problem with the network username or password. You may need to re-select the backup disk and enter the correct username and password."
I have removed the shared volume several times from Time Machine and added it back....still get the same error above, even when the volume is already mounted to my MacBooks desktop! I don't know what else to try. I used to Keychain to verify the log in password is correct and it is.
....I can even copy files to the (2nd) partition on the Mobius2 (connected to my iMac) when the volume is mounted on the MacBooks desktop.
So I don't know why Time Machine keeps saying the "networked backup disk couldn't be accessed". Can anyone help? (see attached screen shots)
Jeff
Screen Shots:
https://www.dropbox.com/sh/22p4f7uu5x8suoh/AABfX-t8_sW7IVSmjgVT7jB4a?dl=0

Hi Eric,
I was able to change the permissions for "everyone" on the iMac for the connected USB drive partition. But not on the MacBook when this partition is mounted on the MacBook desktop. I get this error saying I don't have the necessary permission to change it from "No Access" to "Read & Write":
https://www.dropbox.com/s/aq3zme6ew7oatgg/MobiusTMbackup6.tiff?dl=0
I don't even understand why it says "No Access" for "everyone" when I gave "everyone" Read & Write privileges on the iMac for this drive/partition!
You said "Apple officially only supports Time Capsules as NAS backups." but on the page you sent me it says:
"You can use Time Machine with a Time Capsule, and with USB, FireWire, and Thunderbolt disks. The backup disk can be directly connected to your computer or be on a network. If the backup disk has been divided into partitions, you can use one of the partitions."
....."directly connected to your computer or be on a network" = NAS? If that's what it means Apple needs to be more clear, as my USB drive and its' partitions ARE on a my network, and I can put files on them and access them across my network.
I am trying to get a 2nd network Time Machine backup going as the Time Machine backup of my MacBook became corrupted and I could not restore my mail, even though my mail files were in there, I could restore files but I could not access my mail directory no matter what I tried, Apple has some kind of lock on it now and hides it. I had to resort to my BackBlaze backup to restore my mail, luckily BackBlaze does not hide the mail directory.
So it seems I have a $3000 iMac with a RAID 1 drive (with two brand new 4TB HGST drives) connected to it (that I bought just to improve my backups) and Time Machine and the vaunted "OS X" ("the world’s most advanced desktop operating system") can't handle it. Great.
But I do appreciate your help Eric...
Come on Apple, FIX THIS.
Jeff

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Name: RAIDiator
Version: 3.01c1-p6
Date: Tue Dec 12 17:46:22 2006
Size: 46566912 bytes
Reason: Final 6.
We should probably start a new topic in networking on this. I am seeing some strangeness with afp shares as well.
I have most shares set up to allow access by both CIFS/SMB and AFP. If I use Sidebar and try to access the shares by AFP, it says it can't connect to the server. But the same shares via CIFS works fine. (I can click on the "Windows" server icon and connect.) But for any of these shares, I can manually connect with the normal Go > Connect to Server... method, specifying afp://<ip address> and that works fine.
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Bernard778 wrote:
I have the very same problem. MB recognizes my 2TB Verbatim when connected directly via USB and Time Machine goes to work. When I connect the HDD to my router, my MB sees the HDD in Finder, but Time Machine can't find it ("Airport Utility was unable to find any Airport wireless devices. Make sure the Airport wireless device you want to set up is plugged in and in range of your computer, and then rescan again.").
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You have two problems with this setup.
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Time Machine can't connect/use shared network volume

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