SSD plus 1 TB installed in a Mac mini

I purchased an SSD plus from Amazon (SanDisk SSD PLUS 1TB Internal SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 535 MB/s - SDSSDA-1T00-G26) in 2019 and installed it in my Late 2012 Mac Mini. I am currently running macOS Catalina but a recent attempt to update the OS has caused a big headache. The OS installation fails with the following message:

macOS cannot be installed on your computer

Storage system verify or repair failed.: (-69716)
Quit the installer to restart your computer and try again.

I tried to fix the SSD using Disk Utility but ran into problems. Using disk utility I can see the SSD(1 TB) listed twice (SSD name and SSD name - Data). The second listing shows used 908 GB data, while the first listing shows used 11.28 GB data. The SSD has about 72 GB of free space as per disk utility. Trying to repair the SSD using Disk Utility gave me the following error message:

Repairing file system.

Volume was successfully unmounted.

Performing fsck_apfs -y -x/dev/rdisk2s1

Checking the container super block.

warning: container has been mounted by APFS version 1412.141.2, which is newer than 1412.141.1

warning: disabling over allocation repairs by default; use – o to override

Checking the EFI jumpstart record.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking volume.

Checking the EPFS volume super block.

The volume SanDisk SSD +1000 GB media - Data was formatted by asr(945.250.134) and last modified by apfs_kext (1412.141.1)

Checking the object map.

error: (oid 0x17715a) om: btn: dev_read_finish(153-6346, 1): input/output error

Object map is invalid.

The volume cannot be verified completely.

Filesystem check exit code is 8.

Restoring your original state found as mounted.

Filesystem verify or repair failed.: (-69845)

Somebody please help!

Hi @Linas21,

Please contact the SD Technical Support team for best assistance and troubleshooting:

Hi I have contacted them but no one has replied back yet.