System authorization is required for syncing mobile phone contacts. Without the authorization, the contacts in your watch cannot be used. Normally, you will just need to turn on related authorization in your system and safety software settings. Or you can select "Allow" or "Remember my choice" when the system asks for your authorization.
Please follow the instructions for Samsung, Oneplus, Huawei, Xiaomi to check contact settings.
Samsung: Settings > Applications - Application manager > Ticwear Global - Permissions - Turn on Contacts
Oneplus: Settings > Apps > Ticwear Global > Permissions > Turn on Contacts
Huawei: Settings > Apps > Ticwear Global > App permissions > Turn on Contacts
Xiaomi: Settings > Apps > Ticwear Global > App permissions > Turn on Contacts