Daily calorie allowance question

Hi everyone I have a question regarding my daily calorie allowance mainly about my activity level for determining how many calories I need a day.

I work a sedentary job (office IT job) I am sat at my desk for 8 hours a day but I want to share my daily activity as I really don’t think I’m sedentary.

I get 10,000 steps a day EVERY day, I also lift weights 5 days a week and after every weight lifting session I walk 20 minutes on a treadmill at 6.2kmph at a 3.0 incline, this is my routine Monday to Friday and every Saturday I run a 5km and also get 10,000 steps on top of running the 5km and then on Sunday I don’t do any lifting or cardio I just get my 10,000 steps then I rest and do nothing.

I do this same routine every week without fail but according to google because I work a sedentary job it means I am sedentary and puts me on the lowest calories for my daily maintenance.

Can someone please help me and help me understand what my activity level is as I feel I’m being given incorrect daily calorie allowance.

Thankyou