Problems with graph showing timestamped data, can't use working calendar as x axis.

Hello  everyone,

I am working professionally with processing and visualizing timestamped sensor data, like temperature and power. For that purpose, I have built a DAX calendar table with date and time for use as the x axis in graphs and for a time slicer.

However, when consuming data from a certain API, I simply can't make PBI show data or do time slicing using my trusted method. I have spent hours and hours trying to pinpoint the problem, but I'm at my wits end and hope for some useful feedback from you people.

When visualizing data using the data table timestamps as x axis, there is no problem:

But when I replace the timestamp column with my own datetime column, nothing is shown:

Here is the DAX code for my calendar:

CalendarDate = //

ADDCOLUMNS 
(
    //calendarauto(1),
    CALENDAR( min( 'Tagsdata Between'[d] ), max( 'Tagsdata Between'[d] ) ),
    "Year", YEAR ( [Date] ),
    "QuarterOfYear", Quarter ( [Date] ),
    "MonthOfYear", MONTH( [Date] ),
    "WeekOfYear", WEEKNUM( [Date], 1 ),
    "DayOfMonth", DAY( [Date] ),
    "DayOfWeek", WEEKDAY ( [Date] ),
    "DayName",  FORMAT ( [Date], "dddd" ),
    "MonthName",  FORMAT ( [Date], "mmmm" ),
    "IsWorkingDay", NOT WEEKDAY( [Date] ) IN { 1,7 }
)

CalendarTime = //

VAR HourTable    = SELECTCOLUMNS( GENERATESERIES( 0, 23 ), "Hour",   [Value] )
VAR MinuteTable  = SELECTCOLUMNS( GENERATESERIES( 0, 59 ), "Minute", [Value] )
VAR SecondsTable = SELECTCOLUMNS( GENERATESERIES( 0, 59 ), "Second", [Value] )

RETURN
 
ADDCOLUMNS
(
    //CROSSJOIN( HourTable, MinuteTable, SecondsTable ),
    CROSSJOIN( HourTable, MinuteTable ),

    //"Time", TIME( [Hour], [Minute], [Second] )
    "Time", TIME( [Hour], [Minute], 0 )
)

CalendarDateTime = //

ADDCOLUMNS
( 
    CROSSJOIN( 'CalendarDate' , 'CalendarTime' ),
    "DateTime", 'CalendarDate'[Date] + 'CalendarTime'[Time]
)

Screenshot of CalendarDateTime:

Screenshot of relations:

Here is the raw output from the API that I'm having trouble with ("d" is timestamp and "v" is sensor value):

{"d":"2020-08-25T21:27:50.298Z","v":0.002}

I have tried changing the formatting, and both included and excluded seconds in my calendar table. 

In the M Power Query all relevant columns are casted to type datetime.

What am I overlooking?

Cheers & have a nice weekend,

Mike