Cannot get or set service tag

[thesmartwon]

➜  libsmbios git:(master) sudo smbios-sys-info --trace -v --service-tag --set=5WK2M53
ENTER SmbiosTable()
ENTER __init__(<libsmbios_c.smbios._SmbiosTable object at 0x7f6252a843c0>, 1, )
ENTER _errorOnNullPtrFN(<libsmbios_c.smbios.LP__SmbiosTable object at 0x7f6252a84440>, <_FuncPtr object at 0x7f6252e4a800>, (1,), )
RAN CTYPES FUNCTION: smbios_table_factory
LEAVE _errorOnNullPtrFN --> <libsmbios_c.smbios.LP__SmbiosTable object at 0x7f6252a84440>

LEAVE __init__ --> None

LEAVE SmbiosTable --> <libsmbios_c.smbios._SmbiosTable object at 0x7f6252a843c0>

Current tag value:
ENTER _freeLibStringFN(<ctypes.LP_c_char object at 0x7f6252a844c0>, <_FuncPtr object at 0x7f6252a58d00>, (), )
RAN CTYPES FUNCTION: sysinfo_get_service_tag
LEAVE _freeLibStringFN --> ''

Service Tag:

Setting new tag value: 5WK2M53
ENTER set_service_tag(b'5WK2M53', None, None, )
LEAVE set_service_tag --> -1

➜  libsmbios git:(master) sudo smbios-sys-info-lite
Libsmbios:    2.4.3
System ID:    0x097D
Error getting the Service Tag:  unknown error
Asset Tag:  ASSETTAG02
Product Name: XPS 15 9500
BIOS Version: 1.12.0
Vendor:       Dell Inc.
Is Dell:      1
OEM String 1: Dell System
OEM String 2: 1[097D]
OEM String 3: 3[1.0]
OEM String 4: 12[www.dell.com]
OEM String 5: 14[1]
OEM String 6: 15[0]

I dual boot Windows and Linux on a XPS 15 9500. They are on separate drives:

➜  ~ git:(master) ✗ lsblk
NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
nvme1n1     259:0    0 953.9G  0 disk
├─nvme1n1p1 259:1    0   512M  0 part /boot
├─nvme1n1p2 259:2    0    34G  0 part [SWAP]
└─nvme1n1p3 259:3    0 919.4G  0 part /
nvme0n1     259:4    0 238.5G  0 disk
├─nvme0n1p1 259:5    0    16M  0 part
└─nvme0n1p2 259:6    0 238.5G  0 part

After updating my Arch install about a month ago my service tag was unset. Every time I boot the fans run at 100% and I see a message that the BIOS is in manufacturing mode and the service tag needs to be set. Whenever I click "Apply" after setting the service tag in the BIOS the tag disappears and it doesn't save. I tried updating and later resetting the BIOS all to no avail.

Is there a way for me to workaround this? I'm tired of having to press "Alt+F" twice when booting to have the fans not run at 100%.