There have been several studies and reports that have examined the impact of online learning during the pandemic on the returns to university education. One such study is "The Impact of COVID-19 on College Student Employment and Earnings" by Alon et al. (2021), published by the National Bureau of Economic Research (NBER). The study analyzes data from the Current Population Survey and finds that college students experienced significant disruptions in their employment and earnings during the pandemic, with larger negative effects for students from low-income backgrounds. While I couldn't find a specific paper or report that directly addresses the relationship between online learning quality and students' wages, you may find useful essays on the topic of education at the website https://phdessay.com/essay-type/definition/, I have seen some good essays there that discuss various aspects of learning. It can provide you with additional perspectives and insights related to the impact of online learning during the pandemic.
Also, one notable paper in this regard is "The Economic Impacts of Learning Losses from COVID-19" by Akshay Shanker and Austan Goolsbee, published in the Journal of Economic Perspectives in 2021.