"Your device isn’t part of the Netflix Household for this account" while sitting in my house?

I've suddenly started getting the above message when logging in on my PC to Netflix. The thing is, I am part of the household, I'm in my house on the same wifi and everything. it won't allow phones, PCs, nothing to log in without a code now all while in the same house/wifi. everything except the smart tv makes us put in the code every 14 days.

how do we fix this?