Cannot Create CalDAV Tasks without Due Date (fastmail)

[jeffwjensen]

What Happened?

When creating a new task in a CalDAV task list, without a due date I get the error:

Adding task failed

The task list registry may be unavailable or unable to be written to.

Cannot create calendar object: Failed to put data: HTTP error code 403 (Forbidden): Can't parse as DATE-TIME value in DUE property. Removing entire property: 00000000T000000[valid-calendar-data][responsedescription]

Other Details

• my caldav server is caldav.fastmail.com
• I'm logged into CalDAV in Evolution and it seems to show in Tasks
• I'm using Manjaro
• I view all my tasks fine, and can create tasks with dates without issue

Steps to Reproduce

1. Evolution > Edit > Accounts > Add > Collection Account > fastmail.com
2. Open Tasks and see all the task-list enabled calendars with their tasks.
3. Type in "Some Task w/o Date" the text field above the list of tasks
4. Press Enter

Expected Behavior

I believe a task (with out a due date) should be created.

OS Version

Other Linux

Software Version

Latest release (I have run all updates)

Log Output

THIS ONLY OUTPUTS ON APPLICATION LOAD, NOT WHEN THE ERROR OCCURS

../mesa-22.1.7/src/intel/isl/isl.c:2216: FINISHME: ../mesa-22.1.7/src/intel/isl/isl.c:isl_surf_supports_ccs: CCS for 3D textures is disabled, but a workaround is available.

(io.elementary.tasks:106371): GLib-GIO-CRITICAL **: 09:27:37.518: g_task_propagate_pointer: assertion 'task->result_set' failed

Hardware Info

No response

I think this can be an issue with FastMail. I'm having the same issue and even Planner seemed to having issues adding tasks. Don't think FastMail supports CalDav tasks.