Two Partition Limit on 2 TB External List?

I formatted a 2 TB Seagate Backup Plus Slim portable drive as MacOs Journal Extended Journaled (Encrypted). I tried to create four partitions on the drive, but got a message stating that not more than two partitions could be created. I've never run into this before. Any ideas? Seagate was no help. Thanks.

UPDATE FROM OP:
Figuring I ran into some fluke, I took Barney's advice and started over. This time, I formatted the drive as Mac OS Extended (Journaled) - i.e., no encryption. I was able to create three partitions in the normal fashion without a problem. I attempted to encrypt the three partitions from the Finder but received the following error message: "A Recovery System for the targeted disk is required."
So I erased the drive again and formatted it as Mac OS Extended (Journaled, Encrypted). Once again, I was unable to create more than two partitions. Specifically, one partition was created by default and the number of possible partitions in the dropdown menu was limited to two. The following message appeared: "You may only split this partition into two. To do this, click +."
Congratulations to me - I was able to reproduce my original problem. For some reason, encryption seems to stymie my efforts to create more than two partitions on this drive. Any further ideas?

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Hi,
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
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Two Partition Limit on 2 TB External List?

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