Refer to relevant Steam Support troubleshooting articles. Namely, this one: https://help.steampowered.com/en/faqs/view/5F3D-1477-AFF9-C4F3
Refer to relevant Steam Support troubleshooting articles. Namely, this one: https://help.steampowered.com/en/faqs/view/5F3D-1477-AFF9-C4F3