The Xbox Live key can only be used in the corresponding region/country :
Platform : Xbox Series X|S
Region/Country : France
There seems to be a difference between the available Store Credit of yours with the site currency you had picked previously. Would you like to:
Path Of Exile Items USD $12.48
World of Warcraft: The War Within Currency USD $57.01
Spotify Accounts USD $96
Rocket League Accounts USD $13
Headspace Accounts USD $1.99
Hay Day (Global) Accounts USD $5