Biblatex: Remove comma before urldate/after url

Question

I'm trying to get rid of the comma that's in between the url and the url date. I'm using

\DeclareFieldFormat{urldate}{%
    [letzter Zugriff: %
    \thefield{urlday}.
    \thefield{urlmonth}.
    \thefield{urlyear}\isdot]}

to get the urldate to show up as I want it to. The output with the link in front of it looks like this: What I want is to get rid of the comma before the open square bracket. My MWE looks like this:

%!TEX program = lualatex 
\documentclass[a4paper, 11pt]{article}
\usepackage[a4paper,left=3cm,right=2.7cm,top=2.5cm,bottom=2.5cm]{geometry}
\usepackage{polyglossia} 
\usepackage{fontspec} 

\usepackage{setspace} %Zeilenabstand auf 1.5
\setstretch{1.4}

\setdefaultlanguage[spelling=new]{german}
\setmainfont{Arial} 
\setlength{\emergencystretch}{2pt} 

\usepackage[style=authoryear-ibid,backend=biber, natbib=true, dashed=false, doi=false, isbn=false, eprint=false]{biblatex} % , block=ragged
\addbibresource{verzeichnis.bib}
\DeclareDelimFormat[bib,biblist]{nametitledelim}{\addcolon\space} % Doppelpunkt nach Jahr in Literaturverzeichnis, 
\renewcommand*{\newunitpunct}{\addcomma\space} 

\DeclareFieldFormat{urldate}{%
    [letzter Zugriff: %
    \thefield{urlday}.%\addspace     %  addcomma works !!!
    \thefield{urlmonth}.%\addspace%
    \thefield{urlyear}\isdot]}

%%%Für klickbare ToC
\usepackage{hyperref}
\hypersetup{
    colorlinks,
    citecolor=black,
    filecolor=black,
    linkcolor=black,
    urlcolor=black,
    breaklinks=true
}

\begin{document}
   ....
  \nocite{*}
  \begingroup
  \raggedright
  \sloppy
  \printbibliography
  \endgroup
 
\end{document}

Bibliography:

@misc{Born.04.05.2020,
 author = {Frobeen, Anne},
 year = {04.05.2020},
 title = {Lernen im Schlaf: - ein Inter­view mit Schlaf­for­scher Jan Born},
 address = {in: https://www.tk.de/techniker/magazin/life-balance/besser-schlafen/schlaf-lernen-gedaechtnis-interview-jan-born-2059292},
 urldate = {2021-02-20}
}

Answer 1

I suggest a number of changes:

• Use the date=short option so you use the proper format for the date field (your current format is not valid).
• Use an @online type, not @misc.
• Use the url field, not the address field which will cause you problems if the URL has special characters.
• Redefine the urlseen string rather than hard coding it in the urldate format.
• Use \mkbibbrackets in your urldate format to get square brackets.
• Redefine the url format for online entries to insert "in: ".

If you do all this, then the comma before the urldate will go away by itself. You are getting it because you are abusing the address field to hold a URL.

MWE

%! TeX Program = lualatex
\documentclass{article}
\begin{filecontents}[overwrite]{\jobname.bib}
@online{frobeen2020,
  author = {Frobeen, Anne},
  date = {2020-05-04},
  title = {Lernen im Schlaf: - ein Inter­view mit Schlaf­for­scher Jan Born},
  url = {https://www.tk.de/techniker/magazin/life-balance/besser-schlafen/schlaf-lernen-gedaechtnis-interview-jan-born-2059292},
  urldate = {2021-02-02}
}
\end{filecontents}
\usepackage{fontspec} 
\usepackage{polyglossia} 
\usepackage{csquotes}
\setdefaultlanguage[spelling=new]{german}
\setmainfont{Arial}
\usepackage[style=authoryear-ibid, date=short]{biblatex}
\urlstyle{same}
\DeclareDelimFormat[bib,biblist]{nametitledelim}{\addcolon\space}
\renewcommand*{\newunitpunct}{\addcomma\space}
\DefineBibliographyStrings{german}{
  urlseen = {letzter Zugriff}
}
\DeclareFieldFormat[online]{url}{\bibstring{in}\intitlepunct\url{#1}}
\DeclareFieldFormat{urldate}{\mkbibbrackets{\bibstring{urlseen}\space#1}}
\addbibresource{\jobname.bib}
\begin{document}
\nocite{*}
\printbibliography
\end{document}