My Passport HFS+ verified but won't mount on Win 10

Just purchased HFS+ for Windows to use with Win 10 on a 2GByte USB 3.0 My Passport for Mac
Paragon sees the right size for partition, verifies it fine (cleaned it up), shows size 1862.32 Gbytes for an HFS+ file system on a GPT partition,
suggests a drive letter to use, but can't assign/mount it.

When I go to Disk Management, it sees the partition 2 as healthy primary partition & right size, but not as HFS Plus, and won't let me mount it either.
I used HFSExplorer earlier without problem - obviously read-only.

I don't want to re-format, since I have old Mac backups and nowhere really to put them & that's why I bought Paragon to start with
(plus HFSExplorer is slow, so would be a pain)

Thanks for any advice.

From logfile:
Found HFS+/HFSX partition on device: \\.\Harddisk1Partition2[1606085778][0x48F8]
HFS: version = 4; blocks = 488195808 x 4096, attrib = 0x80002100, journalInfoBlock = 0x3A37[1606085778][0x48F8] \\.\Harddisk1Partition3: read-only = false
[1606085778][0x48F8]
Found HFS+/HFSX partition on device: \\.\Harddisk1Partition3[1606085778][0x48F8]
HFS: version = 4; blocks = 32768 x 4096, attrib = 0x80002000, journalInfoBlock = 0x2[1606085784][0x48F8] \\?\Volume{8a1da7e6-79b1-4a41-984f-1ede8a36d2d8}: read-only = false
[1606085784][0x48F8] \\?\Volume{46cf77ca-5cbe-4e9c-9eeb-44ddb8974cfd}: read-only = false
...