WeCom-Work Communication&Tools funktioniert nicht

WeCom provides exclusive industry solutions for retail, education, government, manufacturing, catering, financial services and other industries, helping various industries to better serve users on WeChat.  WeCom has been widely adopted by millions of leading organizations, including Xibei Restaurant, Rainbow, P&G, Cartier, WalMart, IKEA, Bank of China, PICC, Deppon Express, Changan Automobile, Shenzhen Mingde Experimental School, Affiliated High School of South China Normal University, Guangzhou Haizhu Bureau of Education, Longhua District Education Bureau, and Shenzhen Taxation Bureau. 1.  Calendar] Organize online and offline meetings, view busy schedules and manage public calendars, and invite colleagues, WeChat customers, upstream and downstream.  Retail Industry] Open APIs for Contact Customers, Customer Group, and Customer Moments.  It also offers productivity tools such as Document, Meeting, Email, Calendar, and WeDrive, and flexible OA apps for effective business communication and management.  Exchange Messages] Add WeChat users as contacts and offer services via private or group chats.  Channel] Invite customers to check activities and live videos through private chats, group chats, and Moments.  Customer Group] Manage the customer groups of members via tools such as Anti-harassment and Group Template.  WeCom is a business communication and office collaboration tool developed by Tencent WeChat Team.  Office and Collaboration] Open APIs for Attendance, Calendar, WeDoc and Meeting are available.  WeCom provides the same communication experience as WeChat and connects with WeChat in an all-round manner.  Meeting] Provide stable meeting experience and integrate screen sharing, e-whiteboard, meeting control, meeting recording, and meeting minutes.  Contact Customers] Companies can view and manage the customers added by members.  Use Document, Meeting and other tools and share apps across companies.  Invite WeChat users to add members to upgrade services.  Invite colleagues, customers or other contacts to collaborate.