[mytrivo]

A long time ago, I set up the metadata plugboard to add the series to mobi files emailed to my kindle. As of Jan. 13, 2020, this is no long happening. On Jan. 11, I emailed a mobi file to kindle and the series is there. But that's the last one it worked for. I've tried updating calibre, reentering the plugboard formula and I've looked through all the calibre preferences. I can't figure out what's going wrong.

Here is my metadata plugboard formula:
format -- mobi
device -- KINDLE2
source template -- {title}{series:| (|}{series_index:0>5.2f| #|)}
destination field -- title
the file name should to look like this -- Book Title (Series Name #01.00)
The files go through but only the Book Title appears on my Kindle Voyage and on my Amazon content docs page. I'm using a GMX email address, in case that makes any difference.

Any ideas or suggestions?