To share Access to Calendar: please refer to the following video.
If you need a more detailed guide, you can refer to the following steps.
Step 1: Open the calendar APP, click on the calendar you want to share, then click "Share".

Step 2: Select the corresponding calendar>Share the link with other users
Step 3: The sending method can be email or other social media apps, as long as the link can be received.
Here we will show how to send the link via Gmail.
Step 4: Click the shared link on other device
Step 5: Click Use APP Enter the calendar APP
Step 6: lt will show that the corresponding calendar has been added.
Step 7: All newly created events can be synchronized.
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