Cookie Illegal key

[myjigglybelly]

I got the Bing 'cookie' from create?bundleVersion (the cookie text length is long) but when I set the os.environ I get an error prompt saying:

File "C:\Users\richa.LAPTOP-F3I1MAE7\AppData\Local\Programs\Python\Python312\Lib\http\cookies.py", line 488, in __set
M.set(key, real_value, coded_value)
File "C:\Users\richa.LAPTOP-F3I1MAE7\AppData\Local\Programs\Python\Python312\Lib\http\cookies.py", line 353, in set
raise CookieError('Illegal key %r' % (key,))
http.cookies.CookieError: Illegal key '<MUID'

I made sure the it follows what's instructed in the pre-requisite: os.environ["BING_COOKIES"] = "< paste here >"
Not sure what I'm doing wrong unless the key that I'm copying is wrong. Thank you for your help in advance.