Glossary entry (derived from question below)
English term or phrase:
affinity bias
Arabic translation:
المحاباة على أساس التوافق/ المحاباة القائمة على الإنسجام / المحاباة الناتجة عن الإنسجام
English term
Egypt
affinity bias
Jul 17, 2019 09:19: TargamaT team changed "Language pair" from "Arabic to English" to "English to Arabic"
Proposed translations
Germany
professional and timely manner
Native in: Arabic (Variants: Yemeni, Saudi , UAE, Standard-Arabian (MSA), Moroccan, Syrian, Libyan, Kuwaiti, Algerian, Jordanian, Tunisian, Iraqi, Sudanese, Egyptian, Lebanese, Palestinian) 
Works in: English to Arabic, German to Arabic, Arabic
المحاباة على أساس التوافق/ المحاباة القائمة على الإنسجام / المحاباة الناتجة عن الإنسجام
المحاباة القائمة على الإنسجام
المحاباة الناتجة عن الإنسجام
المحاباة بسبب صلة القربى
https://www.futurelearn.com/courses/diversity-inclusion-awar...
Affinity bias is the unconscious tendency to get along with others who are like us. It is easy to socialize and spend time with others who are not different. It requires more effort to bridge differences when diversity is present.
France
Arabic professional content & beyond...
Native in: Arabic (Variant: Standard-Arabian (MSA)) 
, French (Variant: Standard-France)
Works in: English to Arabic, French to Arabic, German to Arabic, and 6 more.
تحيز/ميل يستند إلى التقارب
Egypt
Technical,Engineering,Marketing, IT, Law
Native in: Arabic
Works in: English to Arabic, Arabic to English
تحيز بسبب صلة القربى أو المصاهرة/تحيز قائم على الانجذاب أو الألفة
https://hackinghr.io/blog/how-affinity-bias-is-harming-your-...
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والله أعلم
https://www.almaany.com/en/dict/ar-en/affinity/
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https://www.google.com/search?safe=active&client=firefox-b-d...
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Canada
translation, subtitling, localization
Native in: Arabic (Variants: Standard-Arabian (MSA), Iraqi)
Works in: English to Arabic, Arabic to English
المحاباة على أساس الموالاة / التجانف على أساس التآلف
مُحاباةُ الأصهار - مُحابَاةٌ بسبب المُصاهَرَة/القَرابَة - مُحاباةُ القَرابات
Affinity;
(1)مُصاهَرَة
(2) صِلَة، علاقة، نَسَب
(7-ب) القَرَابَة
SourceP Al-Mawrid Al-Hadeeth, Page 38.
Bias: مُحاباة
https://www.almaany.com/ar/dict/ar-en/محاباة/
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Note added at 1 day 32 mins (2019-07-18 09:36:48 GMT)
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I think that the term " مُحاباة ", solo, may also be an appropriate answer for the question, as the Arabic term comprehends all the meanings mentioned in Al-Mawrid Al-Hadeeth Dictionary for " Affinity", i.e., تآلف، تجانس، انجذاب، ألفَة، شَبَه، حُب، غرام، ولوع، .
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