The bypolls were necessitated following the death of Beni Prasad Verma from UP and M P Veerendra Kumar from Kerala earlier this year.
The notices were served to Wangkhei MLA Okram Henry Singh and Sagolband MLA Rajkumar Imo Singh on Friday.
The new members, including 36 first timers, took the oath of office in the Rajya Sabha chamber while following physical distancing norms.
This is the first time that oath-taking of members will take place in the House chamber during the inter-session period so as to maintain norms of physical distancing due to COVID-19.
During a meeting with Naidu, Rajya Sabha officials pointed out that committees have been meeting without the quorum for years.
The Rajya Sabha Secretariat is planning staggered seating arrangements for MPs in conformity with the physical distancing norm during the upcoming monsoon session.
Though Jadeja was directed to cast his vote for a Congress candidate in the June 19 elections to four seats, he apparently voted for a BJP nominee.
The Congress has accused the BJP of horse-trading, alleging that it had engineered defections from its ranks for political gains.
Titular king Leishemba Sanajaoba of the BJP won the lone Rajya Sabha seat in Manipur.
TDP leader Atchannaidu couldn't cast his vote as he is undergoing treatment in hospital while Anagani Satya Prasad didn't come citing 'home quarantine'.
MLA Kesarisinh Jesangbhai Solanki was hospitalised following a health issue, reached the polling booth directly from the hospital.
For the four seats from Andhra Pradesh, five candidates -- four from ruling YSRC and one from opposition TDP -- are in the fray.
Apart from routine preparations, authorities have made special arrangements for sanitisation, social distancing etc.in view of coronavirus pandemic.
Both the parties have fielded two candidates each for the three seats of the Upper House of Parliament.
Sources in the party revealed that all 26 BJP MLAs will stay in hostel rooms of the school till RS polls are conducted and leave the campus only for polling on Friday.