This is one of the pics of the fruit, the jar is 6oz for size reference

This is one of the Google results I got

This is the second of the results I got from Google

This is the tree itself during the summer

This is the tag that is on the tree

These are the other tags that were with it

This is it currently, poor thing was missed watering just before it came in for the winter, I originally had it by a large very sunny window for a few months, recently I put it in a bedroom with a heated seed mat and grow light lamps with the tinfoil for reflection to try and trick it into thinking it's an early spring, it's just starting to throw out a new flush of growth

This is the current plant food I have, I've been advised by others on Facebook regarding other trees I need to get a different citrus food, which I'll be doing when I can, any suggestions are greatly appreciated

Jacks also makes a citrus tree food 25-5-15 with trace minerals.

Meyer's LEMON, is a hybrid of a Citron (Citrus medica) x, a hybrid of Mandarin X Pomelo. Citrus are not easy indoors, I am lucky enough to be able to overwinter all mine in a chilly garage. Hot lights may be drying them out. I don't feed at all in the winter under the chilly conditions.

I made a few posts on some Facebook citrus groups, over the last couple days, with the help of their comments and Googling it differently I found this. Which makes me seriously question why on earth they would call a Meyer Lemon a Meyer Lime, here I am thinking I found a brand new grafting variety
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After growing Meyer Lemon seedlings and dealing with how fussy they were I swore I would never own a Meyer Lemon, that explains why this one has been such a diva
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Nice, I've grown a number of citrus from seed, gave away most of them, I don't mind waiting the years it can take to first flower because I love growing them and it helps me learn for when I am able to replace my Poncirus (Flying Dragon) Trifolata. I had gotten it to grow for seeds to graft my own dwarf citrus and shortne the time to bear fruit so I know if the tree is worth growing or not. I have some Kumquat seeds from Esty I bought from a Star Seller, I know ordering seeds online isn't always a guarantee, especially in winter but I wanted to try as I've had a lot of success with other seeds I've bought from Esty

citrus seeds die when they dry out.

I would take it off the heat mat. You don't want the roots to be warmer than room temperature. I grew a Meyer for many years. The only issue was scale. It went outside from spring to autumn and spent winter in a frost free, but unheated, glass porch. It was only fed in summer and it was repotted every couple of years.