Thingspeak channel not updating when using SIM7000E nb-hat via Tera term

Hello, a newbie here! I'm testing my SIM7000e nb-iot-hat on my laptop. The problem is, while I'm trying to send data to my channel, on Tera Therm everything seems to be fine and working out nicely but the channel is not updating at all. Before I attached the SIM7000e to my laptop, I was able to update my channel through Putty & GET-method, so yes, API-key etc. should be right. And as I said, it seems to be working totally fine when I'm testing the 7000E but in fact nothing happens on my channel. This is what I'm getting:

at+cipstart="TCP", "api.thingspeak.com", 80

OK

CONNECT OK

at+cipsend=72

> GET https://api.thingspeak.com/update?api_key=MY_API_KEY_HERE&field2=69

SEND OK

CLOSED

I've also tried bare at+cipsend, but the result is same, or sometimes I might get this:

CONNECT OK

at+cipsend

> GET api.thingspeak.com/update?api_key=M1ST66KDHG3AZIUQ&field2=15

SEND OK

HTTP/1.1 400 Bad Request

Server: awselb/2.0

Date: Thu, 08 Sep 2022 16:23:22 GMT

Content-Type: text/html

Content-Length: 122

Connection: close

I have no clue what I'm missing here, so I'd really appreciate any help I can get. I'm working on a project on Raspberry and I'm trying to get couple of sensors to post the measured data on Thingspeak, so after I figure this one out the next thing is to try to use Python to get all this running automatically. Thanks in advance!