Microsoft teams not able to open

Microsoft teams not able to open and not able to login microsoft teams and not able to do school  classes . https://docs.microsoft.com/en-in/microsoft-365/admin/contact-support-for-business-products?view=o365-worldwide&tabs=phone . i opened this site to call they helped me to open this site . they told post your reply here with a signed account which has problem . and post your queries here it will be solved . #Microsoft Teams .