How could I create an timer trigger with Azure Functions *(version 3 and .NET Core)* that must be executed every first Tuesday from every month at 8 AM. Starting from now *(05/08/2020)* this must be the next five occurrences:

1. 2020/06/02 Tue 08:00:00
2. 2020/07/07 Tue 08:00:00
3. 2020/08/04 Tue 08:00:00
4. 2020/09/01 Tue 08:00:00
5. 2020/10/06 Tue 08:00:00

By using [www.cronmaker.com](http://www.cronmaker.com/), I've next NCRONTAB:

```none
0 0 8 ? 1/1 TUE#1 *

```

But then I've next exception:

> 
> The schedule expression `0 0 8 ? 1/1 Tue#1 *` was not recognized as a valid CRON expression or TimeSpan string.
> 
> 
> 

Then I've start changing the CRON expression to next varations:

```none
CORN              | Result
----------------- |-------------------------------------------
0 0 8 ? 1/1 Tue#1 | Error from above
0 0 8 * 1/1 Tue#1 | Error from above
0 0 8 1/1 Tue#1 * | Error from above
0 0 8 * 1/1 Tue 1 | Error from above
0 0 8 ? 1/1 Tue 1 | Error from above
0 0 8 * 1/1 Tue/1 | 2020/05/29 08:00:00 - 2020/05/30 08:00:00
0 0 8 * * Tue/2   | 2020/05/30 08:00:00 - 2020/06/02 08:00:00
0 0 8 * 1/1 Tue/2 | 2020/05/30 08:00:00 - 2020/06/02 08:00:00
0 0 8 ? 1/1 Tue/2 | Error from above

```

So every expression I've made, would not work as expected. My question is now: What's the correct expression?