If you are using WhatsApp templates, you'll need to make sure to create those templates with the correct languages so that they map correctly to the languages in your account.

Note that due to how the two platforms treat languages, there are a few WhatsApp languages that have no direct analogs. Specifically you should avoid using the following languages that are specific to regions, just use the generic language instead:
  * Chinese (HKG) (zh_HK)
  * Chinese (TAI) (zh_TW)
  * English (UK) (en_UK)
  * English (US) (en_US)
  * Portugese (Brazil) (pt_BR)
  * Spanish (Argentina) (es_AR)
  * Spanish (Spain) (es_SPA)
  * Spanish (Mexico) (es_MX)

Other languages are mapped as follows:

af="afr"     # Afrikaans
sq="sqi"     # Albanian
ar="ara"     # Arabic
az="aze"     # Azerbaijani
bn="ben"     # Bengali
bg="bul"     # Bulgarian
ca="cat"     # Catalan
zh_CN="zho"  # Chinese (CHN)
hr="hrv"     # Croatian
cs="ces"     # Czech
da="dah"     # Danish
nl="nld"     # Dutch
en="eng"     # English
et="est"     # Estonian
fil="fil"    # Filipino
fi="fin"     # Finnish
fr="fra"     # French
de="deu"     # German
el="ell"     # Greek
gu="gul"     # Gujarati
he="enb"     # Hebrew
hi="hin"     # Hindi
hu="hun"     # Hungarian
id="ind"     # Indonesian
ga="gle"     # Irish
it="ita"     # Italian
ja="jpn"     # Japanese
kn="kan"     # Kannada
kk="kaz"     # Kazakh
ko="kor"     # Korean
lo="lao"     # Lao
lv="lav"     # Latvian
lt="lit"     # Lithuanian
mk="mkd"     # Macedonian
ms="msa"     # Malay
mr="mar"     # Marathi
nb="nob"     # Norwegian
fa="fas"     # Persian
pl="pol"     # Polish
pt_PT="por"  # Portuguese (PT)
pa="pan"     # Punjabi
ro="ron"     # Romanian
ru="rus"     # Russian
sr="srp"     # Serbian
sk="slk"     # Slovak
sl="slv"     # Slovenian
es="spa"     # Spanish
sw="swa"     # Swahili
sv="swe"     # Swedish
ta="tam"     # Tamil
te="tel"     # Telugu
th="tha"     # Thai
tr="tur"     # Turkish
uk="ukr"     # Ukrainian
ur="urd"     # Urdu
uz="uzb"     # Uzbek
vi="vie"     # Vietnamese
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