I agree in that case the dysfunctions stems from the other company, that is much harder to work with since you don't share the same organization so don't have a

I agree in that case the dysfunctions stems from the other company, that is much harder to work with since you don't share the same organization so don't have a joint manager. In that case your manager has to decide, and seems they decided to ignore the customer in this case which is probably reasonable. Anyway, not sure why that was due to OKR. Maybe the decision was rushed due to OKR deadlines as you say, maybe it would have been rushed anyway, but at least OKR makes these problems more visible and makes it easier to work with them. OKR in general makes it much easier for managers to do their job, and you really want your managers to do their job properly.